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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smolyakov D. A., Tarasov A. S., Bondarev M. A., Nikolskaya A. A., Vasiliev V. K., Volochaev M. N., Volkov N. V.
Заглавие : Admittance spectroscopy of dopants implanted in silicon and impurity state-induced AC magnetoresistance effect
Место публикации : Mater. Sci. Semicond. Process. - 2021. - Vol. 126. - Ст.105663. - ISSN 13698001 (ISSN), DOI 10.1016/j.mssp.2021.105663
Примечания : Cited References: 21. - This study was supported by the Government of the Russian Federation , Mega Grant for the Creation of Competitive World-Class Laboratories (Agreement no. 075-15-2019-1886)
Аннотация: A silicon structure doped with Ga using ion implantation has been investigated by admittance spectroscopy. It has been established that the presence of the Ga impurity, along with the B one, in the silicon structure leads to the appearance of the second peak in the temperature dependence of the real part of the impedance (admittance). Moreover, switching-on a magnetic field parallel to the sample plane shifts the singularities in the temperature curve to the high-temperature region. This results in the manifestation of both the positive and negative magnetoresistance effect upon temperature and magnetic field variation. It has been found by the standard admittance spectroscopy analysis of the impedance data that the energy structure of the investigated sample includes two interfacial energy levels ES1(0) = 42 meV and ES2(0) = 69.4 meV. As expected, these energies are consistent with the energies of B and Ga dopants. In a magnetic field, these levels increase by 3 meV for B and 2 meV for Ga, which induces the magnetoresistance effect. It has been demonstrated that the interfacial state-induced magnetoresistance effect can be tuned by ion implantation and dopant selection.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Eremin E. V., Gudim I. A., Temerov V. L., Smolyakov D. A., Molokeev M. S.
Заглавие : Comparing the magnetic and magnetoelectric properties of the SmFe3(BO3)4 ferroborate single crystals grown using different solvents
Коллективы : Russian Foundation for Basic Research (RFBR) [18-02-00696_a]; RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund [18-42-240011 p_a]
Место публикации : J. Cryst. Growth. - 2019. - Vol. 518. - P.1-4. - ISSN 0022-0248, DOI 10.1016/j.jcrysgro.2019.04.017. - ISSN 1873-5002(eISSN)
Примечания : Cited References: 17. - This study was supported by the Russian Foundation for Basic Research (RFBR) according to the research projects No. 18-02-00696_a and RFBR, Government of Krasnoyarsk Territory, Krasnoyarsk Region Science and Technology Support Fund by project No. 18-42-240011 p_a.
Предметные рубрики: POLARIZATION
FEATURES
Ключевые слова (''Своб.индексиров.''): impurities--growth from solutions--single crystal growth--borates--ferroelectric materials--magnetic materials
Аннотация: SmFe3(BO3)4 single crystals have been grown from the bismuth trimolybdate and lithium tungstate-based melt–solutions. Samarium ferroborate single crystals were grown first from the lithium–tungstate flux. The magnetic and magnetoelectric properties of the synthesized crystals have been compared. It is shown that the SmFe3(BO3)4 ferroborate grown from the bismuth trimolybdate-based melt–solution contains impurities of Bi3+ ions (∼5% at.), which replace Sm3+ ions, while the SmFe3(BO3)4, ferroborate grown from the lithium tungstate-based melt–solution contains minor or zero amounts of such impurities. The magnetoelectric and magnetodielectric effects with the Bi3+ admixture appeared 1.5× stronger than in SmFe3(BO3)4; this is probably due to twinning.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Shestakov V. A., Korshunov M. M., Togushova Yu. N., Dolgov, O., V
Заглавие : Decisive proofs of the s± → s++ transition in the temperature dependence of the magnetic penetration depth
Коллективы : Russian Foundation for Basic Research (RFBR)Russian Foundation for Basic Research (RFBR) [19-32-90109]; RFBRRussian Foundation for Basic Research (RFBR); Government of Krasnoyarsk Territory; Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' [19-42-240007]
Место публикации : Supercond. Sci. Technol. - 2021. - Vol. 34, Is. 7. - Ст.075008. - ISSN 0953-2048, DOI 10.1088/1361-6668/abff6f. - ISSN 1361-6668(eISSN)
Примечания : Cited References: 40. - We are grateful to D V Efremov, A S Fedorov, S G Ovchinnikov, E I Shneyder, D Torsello, and A N Yaresko for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (RFBR) Grant No. 19-32-90109 and by RFBR and Government of Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science to the Research Projects 'Electronic correlation effects and multiorbital physics in iron-based materials and cuprates' Grant No. 19-42-240007.
Предметные рубрики: ORDER-PARAMETER
IMPURITIES
SUPERCONDUCTORS
STATES
MODEL
Аннотация: One of the features of the unconventional s± state in iron-based superconductors is possibility to transform to the s++ state with the increase of the nonmagnetic disorder. Detection of such a transition would prove the existence of the s± state. Here we study the temperature dependence of the London magnetic penetration depth within the two-band model for the s± and s++ superconductors. By solving Eliashberg equations accounting for the spin-fluctuation mediated pairing and nonmagnetic impurities in the T-matrix approximation, we have derived a set of specific signatures of the s± → s++ transition: (1) sharp change in the behavior of the penetration depth λL as a function of the impurity scattering rate at low temperatures; (2) before the transition, the slope of ΔλL(T) = λL(T) - λL(0) increases as a function of temperature, and after the transition this value decreases; (3) the sharp jump in the inverse square of the penetration depth as a function of the impurity scattering rate, λL-2(Γa), at the transition; (4) change from the single-gap behavior in the vicinity of the transition to the two-gap behavior upon increase of the impurity scattering rate in the superfluid density ρs(T).
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Efremov D. V., Korshunov M. M., Dolgov O. V., Golubov A. A., Hirschfeld P. J.
Заглавие : Disorder-induced transition between s(+/-) and s(++) states in two-band superconductors
Разночтения заглавия :авие SCOPUS: Disorder-induced transition between sВ± and s++ states in two-band superconductors
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2011. - Vol. 84, Is. 18. - Ст.180512. - ISSN 1098-0121, DOI 10.1103/PhysRevB.84.180512
Примечания : Cited References: 31. - The authors are grateful to S.-L. Drechsler, P. Fulde, I. I. Mazin, V. Mishra, and D. J. Scalapino for useful discussions. The present work was partially supported by the DFG Priority Programme SPP1458 (D.V.E.), Dutch FOM(A.A.G.), DOEDE-FG02-05ER46236 (P.J.H. and M.M.K.), and RFBR 09-02-00127, Presidium of RAS program N5.7, FCP GK P891, and GK 16.740.12.0731, and President of Russia MK-1683.2010.2 (M.M.K.). P.J.H. and M.M.K. are grateful for the support of the Kavli Institute for Theoretical Physics and the Stanford Institute for Materials & Energy Science during the writing of this work.
Предметные рубрики: HIGH-TEMPERATURE SUPERCONDUCTIVITY
IMPURITIES
DENSITY
Аннотация: We have reexamined the problem of disorder in two-band superconductors, and shown, within the framework of the T-matrix approximation, that the suppression of T-c can be described by a single parameter depending on the intraband and interband impurity scattering rates. T-c is shown to be more robust against nonmagnetic impurities than would be predicted in the trivial extension of Abrikosov-Gor'kov theory. We find a disorder-induced transition from the s(+/-) state to a gapless and then to a fully gapped s(++) state, controlled by a single parameter-the sign of the average coupling constant (lambda). We argue that this transition has strong implications for experiments.
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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Dolgov O. V., Korshunov M. M., Golubov A. A., Efremov D. V.
Заглавие : Does magnetic scattering always suppress superconducting transition?
Коллективы : Euro-Asian Symposium "Trends in MAGnetism", "Trends in MAGnetism", Euro-Asian Symposium, Институт физики им. Л.В. Киренского Сибирского отделения РАН
Место публикации : VI Euro-Asian Symposium "Trends in MAGnetism" (EASTMAG-2016): abstracts/ ed.: O. A. Maksimova, R. D. Ivantsov. - Krasnoyarsk: KIP RAS SB, 2016. - Ст.I2.5. - P.125. - ISBN 978-5-904603-06-9 (Шифр -478014040)
Примечания : We acknowledge partial support by RFBR (Grant RFBR 16-02-00098)
Ключевые слова (''Своб.индексиров.''): unconventional superconductivity--impurities, pnictides --multiband systems
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Patrin G. S., Beletskii V. V., Velikanov D. A., Volkov N. V., Yurkin G. Yu.
Заглавие : Effect of cobalt impurity ions on the magnetic and electrical properties of iron monosilicide crystals
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 112, Is. 2. - P303-309. - ISSN 1063-7761, DOI 10.1134/S1063776111010146
Примечания : Cited References: 23
Предметные рубрики: GAP FORMATION
FESI
Ключевые слова (''Своб.индексиров.''): concentration dependence--electrical property--energy structures--experimental data--experimental investigations--field dependence--impurity ions--kondo models--magnetic and electrical properties--si crystals--cobalt--crystal impurities--crystals--magnetic susceptibility--electric properties
Аннотация: The results of experimental investigations of Fe1 - x Co (x) Si crystals in the impurity limit with x = 0.001, 0.005, and 0.01 are reported. The temperature and field dependences of the magnetic susceptibility have been studied. According to the experimental data, the introduction of cobalt impurity leads to a change in the energy structure, which is most pronounced in a change in the electrical properties. The temperature, field, and concentration dependences of the resistivity have been measured. The results have been interpreted in the framework of the Kondo model.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aleksandrova I. P., Bartolome J., Falvello L. R., Torres J. M., Sukhovskii A. A.
Заглавие : Effect of impurities on the successive phase transitions in (Cs1-xRbx)(2)ZnI4 compounds
Разночтения заглавия :авие SCOPUS: Effect of impurities on the successive phase transitions in (Cs1-xRbx)2ZnI4 compounds
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2002. - Vol. 14, Is. 49. - P.13623-13634. - ISSN 0953-8984, DOI 10.1088/0953-8984/14/49/316
Примечания : Cited References: 27
Предметные рубрики: X-RAY
CS2ZNI4
SYSTEM
HEAT
Ключевые слова (''Своб.индексиров.''): phase transitions--point defects--specific heat--temperature--x ray diffraction analysis--zinc compounds--lock-in transition--nuclear quadrupole resonance--single crystals
Аннотация: The heat capacity, nuclear quadrupole resonance (NQR) and x-ray diffraction of (Cs1-xRbx)(2)ZnI4 single crystals have been measured, for x = 0, 0.001, 0.005, 0.01, 0.025 and 0.05. The normal to incommensurate (N-Inc) phase transition at T-I, the incommensurate to commensurate (Inc-C) lock-in transition at T-L and the structural commensurate monoclinic to triclinic transition at T-LT, observed in the parent compound (x = 0), takes place for x = 0, 0.001, 0.005 and 0.01. For x = 0.025 only T-I and T-L are detected, while for x = 0.05 no transitions were observable. The values of T-I and T-L increase with x while T-LT decreases and disappears at the concentration x = 0.025. The effect of defects, besides modifying the transition temperatures, is that of broadening and lowering the heat capacity anomaly at the lock-in transition until its total quenching for x = 0.05. No observable hysteresis is detected in this transition. NQR and x-ray diffraction data show the Inc-C transition up to the highest concentration. We conclude that this phenomenology is caused by weak interaction of the incommensurate modulation with point defects even in the region close to the Inc-C transition.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Shustin M. S.
Заглавие : Effect of intersite repulsion on the correlation functions and thermodynamics of an Ising chain with annealed magnetic disorder
Место публикации : Bull. Russ. Acad. Sci. Phys.: Allerton Press, 2016. - Vol. 80, Is. 11. - P.1335-1337. - ISSN 10628738 (ISSN), DOI 10.3103/S1062873816110290
Примечания : Cited References: 6. - This work was supported by the Russian Foundation for Basic Research, project nos. 13-02-00073, 14-02-31237, and 15-42-04372.
Ключевые слова (''Своб.индексиров.''): chains--magnetic susceptibility--temperature distribution--thermodynamics--transfer matrix method--correlation function--equilibrium behavior--equilibrium distributions--non-magnetic impurities--quantum phase transitions--repulsion parameter--temperature dependence--transfer matrix technique--phase transitions
Аннотация: An exact solution for a model describing the equilibrium behavior of an ensemble of Ising chains with nonmagnetic intersite repulsion of nearest neighbors and an equilibrium distribution of nonmagnetic impurities is obtained using the transfer matrix technique. The possibility of exciting quantum phase transitions using the intersite repulsion parameter in a system is demonstrated. Proximity to the critical points of these transitions has a substantial effect on the temperature dependence of a system’s magnetic susceptibility. © 2016, Allerton Press, Inc.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Smolyakov D. A., Tarasov A. S., Shanidze, Lev, Bondarev I. A., Baron F. A., Lukyanenko A. V., Yakovlev I. A., Volochaev M. N., Volkov N. V.
Заглавие : Effect of magnetic and electric fields on the AC resistance of a silicon-on-insulator-based transistor-like device
Коллективы : RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science [20-42-243007, 20-42-240013]; Government of the Russian Federation; Mega-grant for the Creation of Competitive World-Class Laboratories [075-15-2019-1886]
Место публикации : Phys. Status Solidi A. - 2022. - Vol. 219. Is. 1. - Ст.2100459. - ISSN 1862-6300, DOI 10.1002/pssa.202100459. - ISSN 1862-6319(eISSN)
Примечания : Cited References: 19. - The authors thank the Krasnoyarsk Territorial Center for Collective Use, Krasnoyarsk Scientific Center of the SB RAS, for electron microscope investigations. This study was supported by RFBR, Krasnoyarsk Territory and Krasnoyarsk Regional Fund of Science, projects nos. 20-42-243007 and 20-42-240013, and by the Government of the Russian Federation, the Mega-grant for the Creation of Competitive World-Class Laboratories, agreement no. 075-15-2019-1886
Предметные рубрики: NANOSTRUCTURES
Аннотация: Herein, the AC magnetoresistance (MR) in the silicon-on-insulator (SOI)-based Fe/Si/SiO2/p-Si structure is presented. The structure is used for fabricating a back-gate field-effect pseudo-metal-oxide-semiconductor field-effect transistor (MOSFET) device. The effects of the magnetic field and gate voltage on the transport characteristics of the device are investigated. Magnetoimpedance value of up to 100% is obtained due to recharging of the impurity and surface centers at the insulator/semiconductor interface. A resistance variation of up to 1000% is found, which is caused by the voltage applied to the gate and the field effect on the band structure of the sample. Combining the magnetic and electric fields, one can either change the absolute value of the AC resistance while having the MR fixed or change the sign and character of the field dependence of the MR. The observed effects can be used in the development of magnetic-field-driven SOI-based devices and high-frequency circuits.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Semenok D. V., Troyan I. A., Sadakov A. V., Zhou D., Galasso M., Kvashnin A. G., Ivanova A. G., Kruglov I. A., Bykov A. A., Terent'ev K. Yu., Cherepakhin A. V., Sobolevskiy O. A., Pervakov K. S., Seregin A. Y., Helm T., Forster T., Grockowiak A. D., Tozer S. W., Nakamoto Y., Shimizu K., Pudalov V. M., Lyubutin I. S., Oganov A. R.
Заглавие : Effect of magnetic impurities on superconductivity in LaH10
Место публикации : Adv. Mater. - 2022. - Vol. 34, Is. 42. - Ст.2204038. - ISSN 09359648 (ISSN), DOI 10.1002/adma.202204038. - ISSN 15214095 (eISSN)
Примечания : Cited References: 106. - In situ X-ray diffraction experiments at high pressure were performed on SPring-8, station BL10XU, Sayo, Japan (proposal No. 2020A0576). This work was supported by JSPS KAKENHI Grant Number 20H05644. Low-pressure studies were carried out on a synchrotron source of the Kurchatov institute (KISI-Kurchatov), station RKFM. The high-pressure experiments were supported by the Ministry of Science and Higher Education of the Russian Federation within the state assignment of the FSRC Crystallography and Photonics of the RAS. I.A.T. was supported by the Russian Science Foundation, project No. 22-12-00163. A.R.O. thanks the Russian Science Foundation (grant 19-72-30043). D.V.S. thanks the Russian Foundation for Basic Research (project 20-32-90099). I.A.K. thanks the Russian Science Foundation (grant No. 21-73-10261) for the financial support of the anharmonic phonon density of states calculations and molecular dynamics simulations. SEM, XRF, and XRD studies of the initial alloys were performed using the equipment of the Shared Research Center FSRC Crystallography and Photonics of the RAS. I.A.T. and A.G.I. acknowledge the use of the facilities of the Center for Collective Use “Accelerator Center for Neutron Research of the Structure of Substance and Nuclear Medicine” of the INR RAS for high-pressure cell preparation. The research used resources of the LPI Shared Facility Center. V.M.P acknowledge the support of the state assignment of the Ministry of Science and Higher Education of the Russian Federation (Project No. 0023-2019-0005) and A.V.S. and O.A.S. acknowledge the support of the Russian Science Foundation, grant 22-22-00570. K.S.P. thanks the Russian Foundation for Basic Research (project 19-02-00888). I.A.K. thanks the Russian Science Foundation (grant No. 19-73-00237) for the financial support of the development of T-USPEX method and anharmonic phonon density of states calculation algorithm. S.W.T was supported by NSF Cooperative Agreement No. DMR-1157490/1644779 and by the State of Florida. A.D.G. was supported by T.H. and T.F. funding. The authors acknowledge the support of the HLD at HZDR, member of the European Magnetic Field Laboratory (EMFL). The authors also thank Igor Grishin (Skoltech) for proofreading the manuscript, and Dr. C. Tantardini (University of Tromsø) for calculations using the virtual crystal approximation, and Dr. E. Talantsev (IMP RAS) for useful discussions
Аннотация: Polyhydrides are a novel class of superconducting materials with extremely high critical parameters, which is very promising for sensor applications. On the other hand, a complete experimental study of the best so far known superconductor, lanthanum superhydride LaH10, encounters a serious complication because of the large upper critical magnetic field HC2(0), exceeding 120–160 T. It is found that partial replacement of La atoms by magnetic Nd atoms results in significant suppression of superconductivity in LaH10: each at% of Nd causes a decrease in TC by 10–11 K, helping to control the critical parameters of this compound. Strong pulsed magnetic fields up to 68 T are used to study the Hall effect, magnetoresistance, and the magnetic phase diagram of ternary metal polyhydrides for the first time. Surprisingly, (La,Nd)H10 demonstrates completely linear HC2(T) ∝ |T – TC|, which calls into question the applicability of the Werthamer–Helfand–Hohenberg model for polyhydrides. The suppression of superconductivity in LaH10 by magnetic Nd atoms and the robustness of TC with respect to nonmagnetic impurities (e.g., Y, Al, C) under Anderson's theorem gives new experimental evidence of the isotropic (s-wave) character of conventional electron–phonon pairing in lanthanum decahydride.
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11.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ivantsov R. D., Lin C. -R., Chen Y. -Z., Ivanova O. S., Altunin R. R., Knyazev Yu. V., Molokeev M. S., Zharkov S. M., Shestakov N. P., Sukhachev A. L., Edelman I. S.
Заглавие : Effect of surfactants on the structure, phase composition, and magnetic properties of FexSy nanoparticles synthesized by thermal decomposition
Место публикации : Nanobiotechnol. Rep. - 2022. - Vol. 17, Is. 3. - P.336-344. - ISSN 26351676 (ISSN), DOI 10.1134/S2635167622030089
Примечания : Cited References: 27. - This study was supported by the Russian Foundation for Basic Research with Government of Krasnoyarsk Territory, Krasnoyarsk Regional Fund of Science, the research project no. 19-42-240005: “Features of the Electronic Structure, Magnetic Properties, and Optical Excitations in Nanocrystals of Multifunctional Magnetic Chalcogenides Fe3S4 and FeSe” and the Russian Foundation for Basic Research and the Ministry of Science and Technology of Taiwan, joint projects nos. 19-52-52002 and 109-2112-M-153-003 and 108-2923-M-153-001-MY3The electron-microscopy study was carried out at the Laboratory of Electron Microscopy of the Center for Collective Use of the Siberian Federal University within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (research code FSRZ-2020-0011). The magnetic measurements were carried out on a vibrating sample magnetometer at the Krasnoyarsk Regional Center for Collective Use, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences
Аннотация: The effect of surfactants on the structure, morphology, and magnetic properties of FexSy iron-sulfide nanoparticles synthesized by thermal decomposition is studied. Oleylamine, hexadecylamine, and octadecylamine are used as surfactants. It is established by X-ray and electron-diffraction analysis combined with Mossbauer spectroscopy that, in samples 1 and 2 prepared using oleylamine and hexadecylamine, respectively, the Fe3S4 greigite phase dominates, with an inverse spinel structure isostructural to the iron oxide Fe3O4 magnetite with minor Fe9S11 impurities. Deviations in the distribution of iron cations over the tetrahedral and octahedral sites relative to the bulk greigite crystals are observed. The nanoparticles synthesized using octadecylamine (sample 3) are found to be multiphase with a greigite fraction of ~20%. In all three cases, as showed the results of transmission electron microscopy and Fourier transform infrared spectroscopy together with thermogravimetry analysis, the magnetic nanoparticles have an organic shell chemically bonded to their magnetic core, which prevents the agglomeration of the particles. This shell is much more massive in samples 2 and 3. The magnetization values for samples 1 and 2 are similar to those of greigite nanoparticles reported in publications, while the magnetization of sample 3 is several times lower, in accordance with the greigite fraction in it. The combination of fairly high magnetization with a massive organic shell allows one to consider hexadecylamine to be a promising surfactant for the synthesis of iron-sulfide nanoparticles protected from external impact and agglomeration.
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12.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Gudim I. A., Eremin E. V., Krylov A. S., Titova V. R.
Заглавие : Effect of uncontrolled impurities on magnetic and structural transitions of the GdFe3(BO3)4 multiferroic
Коллективы : International Baltic Conference on Magnetism, Балтийский федеральный университет им. И. Канта
Место публикации : V International Baltic Conference on Magnetism. IBCM: Book of abstracts. - 2023. - P.128
Примечания : Cited References: 3. - Support by RSF and KRFS № 22-12-20019 are acknowledged
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13.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Abramova G. M., Pankrats A. I., Petrakovskii G. A., Rasch JCE, Boehm M., Vorotynov A. M., Tugarinov V. I., Szumszak R., Bovina A. F., Vasil'ev V.
Заглавие : Electron spin resonance in CuCrS(2) chrome-copper disulphides synthesized by different methods
Разночтения заглавия :авие SCOPUS: Electron spin resonance in CuCrS 2 chrome-copper disulphides synthesized by different methods
Место публикации : J. Appl. Phys.: AMER INST PHYSICS, 2010. - Vol. 107, Is. 9. - Ст.93914. - ISSN 0021-8979, DOI 10.1063/1.3374679
Примечания : Cited References: 13
Предметные рубрики: COLOSSAL MAGNETORESISTANCE
PHYSICAL-PROPERTIES
TRANSITION
Ключевые слова (''Своб.индексиров.''): chemical vapor transport--electron spin resonance--ferromagnets--g-values--magnetic transitions--polycrystalline--synthesis method--temperature range--astatine--paramagnetism--resonance--single crystals--spin dynamics--crystal impurities
Аннотация: The electron spin resonance (ESR) in CuCrS(2) disulphides is found to be strongly dependent on a synthesis method used. At a temperature of 300 K, a polycrystalline CuCrS(2) sample is paramagnetic with a g-value of 1.95 at 40 K, it undergoes the magnetic transition. In the temperature range 4.2-290 K, a single-crystal sample prepared by a chemical vapor transport method exhibits the ESR features typical of a ferromagnet. It is shown that these features are related to the presence of a small amount of the single-crystal CuCr(2)S(4) impurity in the CuCrS(2) single crystal. (C) 2010 American Institute of Physics. [doi:10.1063/1.3374679]
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14.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Sadreev A. F.
Заглавие : Enhancement of Rayleigh scattering in a two-dimensional Fabry-Perot resonator loaded with impurities
Коллективы : Russian Science Foundation (RSF) [14-12-00266]
Место публикации : J. Opt. Soc. Am. A: Optical Society of America, 2016. - Vol. 33, Is. 7. - P.1277-1282. - ISSN 1084-7529, DOI 10.1364/JOSAA.33.001277. - ISSN 1520-8532(eISSN)
Примечания : Cited References:32. - Russian Science Foundation (RSF) (14-12-00266)
Предметные рубрики: COUPLED-MODE THEORY
MULTIPLE-SCATTERING
NUCLEAR REACTIONS
UNIFIED THEORY
RANDOM-MEDIA
TRANSMISSION
PARTICLES
WAVES
LIGHT
STRIP
Аннотация: We study wave transmission through a Fabry-Perot resonator (FPR) loaded with point-like impurities. We show both analytically in the framework of the coupled mode theory and numerically that there are two different regimes for transmission dependent on the quality of the FPR mirrors. For low quality, we obtain transmittance very similar to the clean FPR with slightly shifted Lorentz peaks. However, for good quality, the transmittance peaks are strongly reduced and substituted with Gaussian peaks because of multiple scattering of waves by each impurity. As a side effect, we observe the angular (channel) conversion in the disordered FPR. We demonstrate that the resonant peaks are dependent on the concentration of impurities to pave a way for resonant measurement of the concentration. (C) 2016 Optical Society of America
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15.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Parker D., Dolgov O. V., Korshunov M. M., Golubov A. A., Mazin I. I.
Заглавие : Extended s(+/-) scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides
Разночтения заглавия :авие SCOPUS: Extended sВ± scenario for the nuclear spin-lattice relaxation rate in superconducting pnictides
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2008. - Vol. 78, Is. 13. - Ст.134524. - ISSN 1098-0121, DOI 10.1103/PhysRevB.78.134524
Примечания : Cited References: 35
Предметные рубрики: IMPURITIES
SCATTERING
GAPS
Аннотация: Recently, several measurements of the nuclear spin-lattice relaxation rate T(1)(-1) in the superconducting Fe pnictides have been reported. These measurements generally show no coherence peak below T(c) and indicate a low-temperature power-law behavior, the characteristics commonly taken as evidence of unconventional superconductivity with lines of nodes crossing the Fermi surface. In this work we show that (i) the lack of a coherence peak is fully consistent with the previously proposed nodeless extended s(+/-)-wave symmetry of the order parameter (whether in the clean or dirty limit) and (ii) the low-temperature power-law behavior can be also explained in the framework of the same model but requires going beyond the Born limit.
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16.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Korshunov M. M., Togushova Yu.N., Dolgov O. V.
Заглавие : Impurities in multiband superconductors
Место публикации : Physics-Uspekhi: Turpion, 2016. - Vol. 59, Is. 12. - P.1211-1240. - ISSN 10637869 (ISSN), DOI 10.3367/UFNe.2016.07.037863
Примечания : Cited References: 200. - We acknowledge partial support by RFBR (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2).
Ключевые слова (''Своб.индексиров.''): unconventional superconductors--iron pnictides--iron chalcogenides--impurity scattering
Аннотация: Disorder impurities and defects violating the ideal long-range order is always present in solids. It can result in interesting and sometimes unexpected effects in multiband superconductors, especially if the superconductivity is uncon-ventional, thus having symmetry other than the usual s-wave. This paper uses the examples of iron-based pnictides and chal-cogenides to examine how both nonmagnetic and magnetic impurities affect superconducting states with s± and s++ order parameters. We show that disorder causes the transition between s± and s++ states and examine what observable effects this transition can produce. © 2016 Uspekhi Fizicheskikh Nauk, Russian Academy of Sciences.
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17.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yurkin G. Yu., Patrin G. S., Yarikov, Stanislav A.
Заглавие : Magnetic Properties of Fe1-xCoxSi Single Crystals at Low Co Impurity Concentrations
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2019. - Vol. 12, Is. 1. - P.94-99. - ISSN 1997-1397, DOI 10.17516/1997-1397-2019-12-1-94-99; \b Журнал СФУ. Математика и физика. - ISSN 2313-6022(eISSN)
Примечания : Cited References: 17
Ключевые слова (''Своб.индексиров.''): co impurities--iron silicide--superparamagnetism--силицид железа--примесь co--суперпарамагнетизм
Аннотация: Magnetostatic properties of FeSi and Fe0,98Co0,02Si single crystals have been studied. It has been found that the temperature and field dependences of the magnetization of monocrystal FeSi are strongly affected by introduction of a small amount of Co (2 %). A description of the results were provided by a model accounting for the formation of superparamagnetic iron clusters, as well as Fe-Co complexes. It is assumed that Fe-Co complexes form a ferromagnetic phase, which is approximately 0.6% of the Fe0,98Co0,02Si sample weight.В работе представлено исследование магнитостатических характеристик образцов FeSi и Fe0,98Co0,02Si. Обнаружено, что внесение небольшого количества примести Co(2%) значительно влияет на температурные и полевые зависимости намагниченности монокристалла FeSi. Результаты обработаны в рамках модели, учитывающей образование суперпарамагнитных кластеров железа, а также комплексов Fe-Co. Предполагается, что комплексы Fe-Co образуют ферромагнитную фазу, которая составляет примерно 0,6 % от массы образца Fe0,98Co0,02Si.
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18.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Yurkin G. Yu., Patrin G. S., Yarikov S. A.
Заглавие : Magnetic Properties of Fe1-xCoxSi Single Crystals at Low Co Impurity Concentrations
Место публикации : J. Sib. Fed. Univ. Math. Phys. - 2019. - Vol. 12, Is. 6. - P.756-771. - ISSN 1997-1397, DOI 10.17516/1997-1397-2019-12-1-1-6; Журн. СФУ. Матем. и физика. - ISSN 2313-6022 (eISSN)
Примечания : Cited References: 17
Аннотация: Velocity of bulk acoustic waves in base and rotated cuts have been measured by the ultrasonic pulse-echo method and values of CE ijkl and eijk in single crystals YAl3(BO3)4 have been calculated. The value of dijk piezoelectric modulus of these single crystals have been determined by quasistatic measurements, and εσ ij dielectric constants have been determined by the flat capacitor method. Experimental values of material constants have been applied for the study of Magnetostatic properties of FeSi and Fe0;98Co0;02Si single crystals have been studied. It has been found that the temperature and field dependences of the magnetization of monocrystal FeSi are strongly affected by introduction of a small amount of Co (2 %). A description of the results were provided by a model accounting for the formation of superparamagnetic iron clusters, as well as Fe-Co complexes. It is assumed that Fe-Co complexes form a ferromagnetic phase, which is approximately 0.6% of the Fe0;98Co0;02Si sample weightВ работе представлено исследование магнитостатических характеристик образцов FeSi и Fe0;98Co0;02Si. Обнаружено, что внесение небольшого количества примести Co (2 %) значительно влияет на температурные и полевые зависимости намагниченности монокристалла FeSi. Результаты обрабобтаны в рамках модели, учетывающей образование суперпарамагнитных кластеров железа, а также комплексов Fe-Co. Предполагается, что комплексы Fe-Co образуют ферромагнитную фазу, которая составляет примерно 0,6 % от массы образца Fe0;98Co0;02Si.
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19.

Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Patrin G. S., Beletsky V. V., Velikanov D. A., Yurkin G. Yu.
Заглавие : Magnetic properties of FeSi crystals with Co impurities
Коллективы : Moscow International Symposium on Magnetism, Московский государственный университет им. М.В. Ломоносова, Российский фонд фундаментальных исследований
Место публикации : Moscow Int. Symp. on Magnet. (MISM-2008): June 20-25, 2008, Moscow : book of abstract. - 2008. - Ст.25PO-13-22. - p.762-763
Примечания : Библиогр.: 3
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20.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Патрин, Геннадий Семёнович, Velikanov D. A., Yurkin G. Yu., Beletsky V. V.
Заглавие : Magnetic properties of FeSi with cobalt impurities
Место публикации : J. Phys. Conf. Ser. - 2010. - Vol. 200, Is. SECTION 6. - ISSN 17426588 (ISSN), DOI 10.1088/1742-6596/200/6/062021
Ключевые слова (''Своб.индексиров.''): experimental research--high temperature--impurity level--low temperatures--magnetic ordering--pure iron--temperature range--cobalt--crystal impurities--magnetic properties--magnetism
Аннотация: Results of experimental researches of impurity level crystals Fe1-xCoxSi are presented in this article. Magnetic properties in a temperature range up to T ? 1000 K are analyzed. It was established that with Co impurities increasing origin of magnetic ordering exists at low temperatures. At high temperatures a high temperature maximum of susceptibility of nominally pure iron monosilicide crystal is observed. © 2010 IOP Publishing Ltd.
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