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Application of Raman spectroscopy for identification of rinneite (K3NaFeCl6) in inclusions in minerals / S. Grishina, P. Kodera, S. Goryainov [et al.] // J. Raman Spectrosc. - 2020. - Vol. 51, Is. 12. - P. 2505-2516, DOI 10.1002/jrs.6005. - Cited References: 55. - Russian Foundation for Basic Research, Grant/Award Numbers: 18-05-00682, 18-05-00682; European Regional Development Fund, Grant/Award Number: ITMS 26240220086; Vedecka Grantova Agentura MSVVaS SR a SAV, Grant/Award Number: 1/0313/20 . - ISSN 0377-0486. - ISSN 1097-4555

РУБ Spectroscopy
Рубрики:
SALT MELT
   IRON
   DEPOSIT
   FLUIDS
   TRANSFORMATIONS
   FERRIHYDRITE
Кл.слова (ненормированные):
daughter mineral -- Fe-oxyhydroxides -- fluid inclusion -- rinneite -- weathering
Аннотация: Solid daughter phases in fluid and salt melt inclusions in minerals provide important clues to characterization of mineral‐forming processes. The analysis of the fluid inclusions often requires the exposure of the daughter minerals. Rinneite (K3NaFeCl6), which is a hygroscopic mineral, decomposes in air and cannot thus be identified by conventional methods. A combined approach has been applied for investigation of synthetic and natural rinneite to acquire its diagnostic Raman spectrum for a nondestructive identification. We used natural rinneite inclusions in halite, suitable for applying a complex of methods, to clear up the reference spectrum. Improved high‐resolution X‐ray diffraction (XRD) data obtained from natural rinneite inclusion are comparable with that of previously published, with similar unit cell dimensions. Polarized Raman spectra of natural inclusions were obtained using different geometries and polarization of the incident and scattered light. Interpretation of experimental Raman spectra was performed within the framework of lattice dynamics simulations and group analysis. Individual spectral bands are interpreted in terms of Raman‐active vibrational modes of K3NaFeCl6 structural units. Raman spectrum of synthetic rinneite with main peaks at 75, 91, 103, 143, 167, 171, 187, and 239 cm−1 agrees well with the spectra of rinneite inclusions in halite from the Nepa potash deposit and rinneite daughter minerals in salt melt inclusions hosted by quartz veinlets from the porphyry gold systems in the Central Slovakia Volcanic Field. This provides a firm basis for any future identification of this mineral worldwide, using nondestructive Raman spectroscopy.

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Держатели документа:
Russian Acad Sci, Sobolev Inst Geol & Mineral, Dept Mineral, Siberian Branch, Novosibirsk, Russia.
Comenius Univ, Dept Econ Geol, Fac Nat Sci, Bratislava, Slovakia.
Kirensky Inst Phys, Mol Spect Lab, Krasnoyarsk, Russia.
Siberian Fed Univ, Inst Engn Phys & Radio Elect, Krasnoyarsk, Russia.
Novosibirsk State Univ, Dept Geol, Novosibirsk, Russia.
Slovak Acad Sci, Inst Inorgan Chem, Bratislava, Slovakia.
Russian Acad Sci, Inst Geol Ore Deposits Petrog Mineral & Geochem, Moscow, Russia.

Доп.точки доступа:
Grishina, Svetlana; Kodera, Peter; Goryainov, Sergey; Oreshonkov, A. S.; Орешонков, Александр Сергеевич; Seryotkin, Yurii; Simko, Frantisek; Polozov, Alexander G.; Russian Foundation for Basic ResearchRussian Foundation for Basic Research (RFBR) [18-05-00682]; European Regional Development FundEuropean Union (EU) [ITMS 26240220086]; Vedecka Grantova Agentura MSVVaS SR a SAV [1/0313/20]
}
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Comparative analysis of characteristic electron energy loss spectra and inelastic scattering cross-section spectra of Fe / A. S. Parshin [et al.] // Phys. Solid State. - 2016. - Vol. 58, Is. 5. - P. 908-914, DOI 10.1134/S106378341605019X. - Cited References: 29 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
Loss-spectroscopy
   Quantitative-analysis
   Iron
   Si
   Ge
Аннотация: The inelastic electron scattering cross section spectra of Fe have been calculated based on experimental spectra of characteristic reflection electron energy loss as dependences of the product of the inelastic mean free path by the differential inelastic electron scattering cross section on the electron energy loss. It has been shown that the inelastic electron scattering cross-section spectra have certain advantages over the electron energy loss spectra in the analysis of the interaction of electrons with substance. The peaks of energy loss in the spectra of characteristic electron energy loss and inelastic electron scattering cross sections have been determined from the integral and differential spectra. It has been shown that the energy of the bulk plasmon is practically independent of the energy of primary electrons in the characteristic electron energy loss spectra and monotonically increases with increasing energy of primary electrons in the inelastic electron scattering cross-section spectra. The variation in the maximum energy of the inelastic electron scattering cross-section spectra is caused by the redistribution of intensities over the peaks of losses due to various excitations. The inelastic electron scattering cross-section spectra have been analyzed using the decomposition of the spectra into peaks of the energy loss. This method has been used for the quantitative estimation of the contributions from different energy loss processes to the inelastic electron scattering cross-section spectra of Fe and for the determination of the nature of the energy loss peaks. © 2016, Pleiades Publishing, Ltd.

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Публикация на русском языке Сравнительный анализ спектров характеристических потерь энергии электронов и спектров сечения неупругого рассеяния в Fe [Текст] / А. С. Паршин [и др.] // Физ. тверд. тела : Физико-технический институт им. А. Ф. Иоффе РАН, 2016. - Т. 58 Вып. 5. - С. 881–887

Держатели документа:
Siberian State Aerospace University, ul. Gazety Krasnoyarskii Rabochii 31, Krasnoyarsk, Russian Federation
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/24, Krasnoyarsk, Russian Federation
Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 13, Novosibirsk, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50/38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Parshin, A. S.; Igumenov, A. Y.; Mikhlin, Y. L.; Pchelyakov, O. P.; Zhigalov, V. S.; Жигалов, Виктор Степанович
}
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Dimensionality of a system of exchange-coupled grains and magnetic properties of nanocrystalline and amorphous ferromagnets / R. S. Iskhakov [et al.] // JETP Letters. - 2000. - Vol. 72, Is. 6. - P. 304-307, DOI 10.1134/1.1328443. - Cited References: 15 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
RANDOM ANISOTROPY
   FILMS
   IRON
   SIZE
Аннотация: Characteristics of random magnetic anisotropy in ferromagnetic films of amorphous Co90P10 and nanocrystalline Ni75C25 , Fe80B4C16 , and Co80C20 alloys and also in multilayer films [Co93P7(x)/Pd(14 Angstrom)](20) and [Co90P10(x)/Pd(14 Angstrom)](20) obtained by various technological procedures were studied experimentally. It was found that the spatial dimensionality (d) of the system of ferromagnetically coupled grains (2R(c)) in the materials under study determined the exponent in the power dependence of the approach of magnetization to saturation in the region of fields H 2A / MRc2. The dependence DeltaM similar to H-1/2 was observed for nanocrystalline and amorphous films with a three-dimensional grain arrangement. The approach to saturation in multilayer films with a two-dimensional grain arrangement in an individual magnetic layer follows the law DeltaM similar to H-1. The main micromagnetic characteristics of random anisotropy, such as the ferromagnetic correlation radius R-f and the average anisotropy [K] of a ferromagnetic domain with a size of 2R(f) , were determined for multilayer Co/Pd films. Correlation was found between the coercive field and these characteristics of random anisotropy. (C) 2000 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Iskhakov, R. S.; Исхаков, Рауф Садыкович; Komogortsev, S. V.; Комогорцев, Сергей Викторович; Balaev, A. D.; Балаев, Александр Дмитриевич; Chekanova, L. A.; Чеканова, Лидия Александровна
}
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Effect of calcination temperature on activity of Fe2O3-Al2O3 nanocomposite catalysts in CO oxidation / A. M. Kremneva, A. V. Fedorov, O. A. Bulavchenko [et al.] // Catal. Lett. - 2020. - Vol. 150. - P. 3377-3385, DOI 10.1007/s10562-020-03250-8. - Cited References: 31. - This work was supported by the Russian Science Foundation (Grant No. 17-73-20157). The experiments were performed using facilities of the shared research center "National center of investigation of catalysts" at Boreskov Institute of Catalysis. The authors thank A.Yu. Gladky for the TPR measurements and Z.S. Vinokurov for the XRD measurements. . - ISSN 1011-372X. - ISSN 1572-879X

РУБ Chemistry, Physical
Рубрики:
MOSSBAUER
   SPECTROSCOPY
   CHEMISTRY
   IRON
   XPS
   ADSORPTION
   OXYGEN
   FE
Кл.слова (ненормированные):
Environmental catalysis -- Nanostructure -- Gasification -- Oxidation -- Mossbauer spectroscopy
Аннотация: Nanocomposite Fe–Al oxide catalysts were prepared by the melting of iron and aluminum nitrates with the subsequent calcination in air at different temperatures. It was found that the catalysts calcined at 450 °C are more active in the oxidation of CO than the catalysts calcined at 700 °C. X-ray diffraction and X-ray photoelectron spectroscopy showed that all the catalysts consist of hematite, α-Fe2O3 nanoparticles, and Al2O3 in an amorphous state. Iron oxide is the active component, which provides the oxidation of CO, while alumina is a texture promoter. The increase in the calcination temperature leads to a minor increase in the average size of hematite nanoparticles and an insignificant decrease in the specific surface area. Kinetic measurements showed that the oxidation of CO over the Fe–Al catalysts calcined at 450 and 700 °C proceeds with the activation energy of 61–69 and 91 kJ/mol, respectively. This means that the low-temperature and high-temperature catalysts contain different active species. Temperature-programmed reduction with CO indicated that the decrease in the calcination temperature improves the reducibility of the Fe-Al nanocomposites. According to 57Fe Mössbauer spectroscopy, the low-temperature catalysts contain hydrated iron oxides (acagenite and ferrihydrite) and a significant amount of highly defective hematite, which is absent in the high-temperature catalyst. These species can provide the enhanced activity of the low-temperature catalysts in the oxidation of CO.

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Держатели документа:
Boreskov Inst Catalysis, Novosibirsk 630090, Russia.
Fed Res Ctr KSC SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Kremneva, A. M.; Fedorov, A. V.; Bulavchenko, O. A.; Knyazev, Yu. V.; Князев, Юрий Владимирович; Saraev, A. A.; Yakovlev, V. A.; Kaichev, V. V.; Russian Science FoundationRussian Science Foundation (RSF) [17-73-20157]; National center of investigation of catalysts" at Boreskov Institute of Catalysis
}
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    Factor analysis of inelastic electron scattering cross section spectra of FeSi2 / A. Y. Igumenov [et al.] // IOP Conf. Ser.: Mater. Sci. Eng. - 2019. - Vol. 467: 21st International Scientific Conference Reshetnev Readings-2017. - Ст. 012010, DOI 10.1088/1757-899X/467/1/012010. - Cited References: 21
Рубрики:
ENERGY-LOSS SPECTROSCOPY
   IRON
Аннотация: Iron disilicide is widely used in creation of such nanotechnology devices as photoelectric converters. The investigation of iron silicide FeSi2 with the method of inelastic electron scattering cross-section spectroscopy was carried out. The decomposition of inelastic electron scattering cross-section spectra of FeSi2 to bulk and surface energy loss components using factor analysis was carried out. The amplitude of energy loss components can be used for identification of their origin.

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Держатели документа:
Reshetnev Siberian State Univ Sci & Technol, Krasnoyarsk 660037, Russia.
Emperor Alexander I St Petersburg State Transport, St Petersburg 190031, Russia.
Russian Acad Sci, Inst Chem & Chem Technol, Siberian Branch, Krasnoyarsk 660036, Russia.
Russian Acad Sci, Rzhanov Inst Semicond Phys, Siberian Branch, Novosibirsk 630090, Russia.
Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Igumenov, A. Yu; Parshin, A. S.; Kanzychakova, V. O.; Demin, A. M.; Andryushchenko, T. A.; Mikhlin, Yu L.; Pehelyakov, O. P.; Zhigalov, V. S.; Жигалов, Виктор Степанович; International Scientific Conference Reshetnev Readings(21st ; Nov 08-11, 2017 ; Krasnoyarsk, Russia)
}
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Frequency-dependent magnetotransport phenomena in a hybrid Fe/SiO2/p-Si structure / N. V. Volkov [et al.] // J. Appl. Phys. - 2012. - Vol. 112, Is. 12. - Ст. 123906, DOI 10.1063/1.4769788. - Cited References: 31. - This study was supported by the Russian Foundation for Basic Research, Project No. 11-02-00367-a; the Presidium of the Russian Academy of Sciences, program Quantum Mesoscopic and Disordered Structures, Project No. 20.8; the Division of Physical Sciences of the Russian Academy of Sciences, program Spin Phenomena in Solids Nanostructures and Spintronics, Project No. II.4.3; the Siberian Branch of the Russian Academy of Sciences, Integration Projects Nos. 85 and 102, and the Federal target program Scientific and Pedagogical Personnel of Innovative Russia (State Contract No. NK-556P_15). . - ISSN 0021-8979

РУБ Physics, Applied
Рубрики:
SILICON
   IRON
   SPINTRONICS
   PAIRS
Аннотация: We report the large magnetoimpedance effect in a hybrid Fe/SiO2/p-Si structure with the Schottky barrier. The pronounced effect of magnetic field on the real and imaginary parts of the impedance has been found at temperatures 25-100K in two relatively narrow frequency ranges around 1 kHz and 100MHz. The observed frequency-dependent magnetotransport effect is related to the presence of localized "magnetic" states near the SiO2/p-Si interface. In these states, two different recharging processes with different relaxation times are implemented. One process is capture-emission of carriers that involves the interface levels and the valence band; the other is the electron tunneling between the ferromagnetic electrode and the interface states through SiO2 potential barrier. In the first case, the applied magnetic field shifts energy levels of the surface states relative to the valence band, which changes recharging characteristic times. In the second case, the magnetic field governs the spin-dependent tunneling of carriers through the potential barrier. The "magnetic" interface states originate, most likely, from the formation of the centers that contain Fe ions, which can easily diffuse through the SiO2 layer. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4769788]

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Держатели документа:
[Volkov, N. V.
Tarasov, A. S.
Eremin, E. V.
Eremin, A. V.
Varnakov, S. N.
Ovchinnikov, S. G.] Russian Acad Sci, Kirensky Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
[Volkov, N. V.
Eremin, E. V.
Varnakov, S. N.] Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia

Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Tarasov, A. S.; Тарасов, Антон Сергеевич; Eremin, E. V.; Еремин, Евгений Владимирович; Eremin, A. V.; Ерёмин, Александр Владимирович; Varnakov, S. N.; Варнаков, Сергей Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
}
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Gavrichkov, V. A.
Cation spin and superexchange interaction in oxide materials below and above spin crossover under high pressure / V. A. Gavrichkov, S. I. Polukeev, S. G. Ovchinnikov // Phys. Rev. B. - 2020. - Vol. 101, Is. 9. - Ст. 094409, DOI 10.1103/PhysRevB.101.094409. - Cited References: 65. - We acknowledge the support of the Russian Science Foundation through Grant No. 18-12-00022 . - ISSN 2469-9950. - ISSN 2469-9969

РУБ Materials Science, Multidisciplinary + Physics, Applied + Physics, Condensed Matter
Рубрики:
EXCHANGE INTERACTION
   PHASE-TRANSITIONS
   STATE
   ELECTRON
   IRON
Аннотация: We derived simple rules for the sign of 180° superexchange interaction based on the multielectron calculations of the superexchange interaction in the transition metal oxides that are valid both below and above spin crossover under high pressure. The superexchange interaction between two cations in dn configurations is given by a sum of partial contributions related to the electron-hole virtual excitations to the different states of the dn+1 and dn−1 configurations. Using these rules, we have analyzed the sign of the 180° superexchange interaction of a number of oxides with magnetic cations in electron configurations from d2 until d8: the iron, cobalt, chromium, nickel, copper, and manganese oxides with increasing pressure. The most interesting result concerns the magnetic state of cobalt and nickel oxides CoO, Ni2O3 and also La2CoO4, LaNiO3 isostructural to well-known high-TC and colossal magnetoresistance materials. These oxides have a spin 12 at the high pressure. Change of the interaction from antiferromagnetic below spin crossover to ferromagnetic above spin crossover is predicted for oxide materials with cations in d5(FeBO3) and d7(CoO) configurations, while for materials with the other dn configurations spin crossover under high pressure does not change the sign of the 180∘ superexchange interaction.

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Держатели документа:
Kirensky Inst Phys, Akadeingorodok 50,Bld 38, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Polukeev, S. I.; Полукеев, Семен Игоревич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Гавричков, Владимир Александрович; Russian Science FoundationRussian Science Foundation (RSF) [18-12-00022]
}
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Ho and Fe magnetic ordering in multiferroic HoFe3(BO3)4 / D. K. Shukla [et al.] // Phys. Rev. B. - 2012. - Vol. 86, Is. 22. - Ст. 224421, DOI 10.1103/PhysRevB.86.224421. - Cited References: 32 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
X-RAY SCATTERING
POLARIZATION DEPENDENCE
IRON
Аннотация: Resonant and nonresonant x-ray scattering studies on HoFe3(BO3)4 reveal competing magnetic ordering of Ho and Fe moments. Temperature and x-ray polarization dependent measurements employed at the Ho L3 edge directly reveal a spiral spin order of the induced Ho moments in the ab plane propagating along the c axis, a screw-type magnetic structure. At about 22.5 K the Fe spins are observed to rotate within the basal plane inducing spontaneous electric polarization, P. Components of P in the basal plane and along the c axis can be scaled with the separated magnetic x-ray scattering intensities of the Fe and Ho magnetic sublattices, respectively.

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Держатели документа:
[Shukla, D. K.
Francoual, S.
Skaugen, A.
von Zimmermann, M.
Walker, H. C.
Strempfer, J.] Deutsch Elektronen Synchrotron DESY, D-22607 Hamburg, Germany
[Bezmaternykh, L. N.
Gudim, I. A.
Temerov, V. L.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia

Доп.точки доступа:
Shukla, D. K.; Francoual, S.; Skaugen, A.; von Zimmermann, M.; Walker, H. C.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Temerov, V. L.; Темеров, Владислав Леонидович; Strempfer, J.
}
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Infrared absorption spectrum of HoFe3(BO3)4 crystal / S. N. Sofronova [et al.] // Vib. Spectrosc. - 2014. - Vol. 72. - P. 20-25, DOI 10.1016/j.vibspec.2014.02.005. - Cited References: 18. - The work was partially supported by the RFBR through Grants No. 13-02-00825 and 13-02-98041, SS-4828.2012.2. . - ISSN 0924-2031. - ISSN 1873-3697

РУБ Chemistry, Analytical + Chemistry, Physical + Spectroscopy
Рубрики:
MAGNETOELASTIC INTERACTIONS
IRON
GDFE3(BO3)4
Кл.слова (ненормированные):
Holmium ferroborate -- Infrared absorption
Аннотация: Infrared (IR) absorption spectra of HoFe3(BO3)4 crystal have been obtained in spectral range 30–7000 cm−1 at temperatures from 4 to 423 K. Vibrational frequencies have been simulated with ‘Lady’ software package both for high-temperature and low-temperature phases. The experimental spectra have been analyzed on the basis of calculated data, and interpreted within the framework of internal vibrations of ionic complexes of HoFe3(BO3)4 crystal lattice. The spectral range under study was observed to have no Davydov splitting of internal vibrational modes due to unit cell multiplication. No effects of magnetic ordering on the IR spectra of the crystal under study were observed in the low-temperature range.

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Держатели документа:
Kirensky Inst Phys SB RAS, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660079, Russia

Доп.точки доступа:
Sofronova, S. N.; Софронова, Светлана Николаевна; Gerasimova, Y. V.; Герасимова, Юлия Валентиновна; Vtyurin, A. N.; Втюрин, Александр Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Shestakov, N. P.; Шестаков, Николай Петрович; Ivanenko, A. A.; Иваненко, Александр Анатольевич; RFBR [13-02-00825, 13-02-98041, SS-4828.2012.2]
}
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10.

    Korshunov, M. M.
    Uniform impurity scattering in two-band s ± and s ++ superconductors / M. M. Korshunov, Y. N. Togushova, O. V. Dolgov // J. Supercond. Nov. Magn. - 2016. - Vol. 29, Is. 4. - P1089-1095, DOI 10.1007/s10948-016-3385-6. - Cited References:28. - We are grateful to D.V. Efremov and A. A. Golubov for useful discussions. We acknowledge the partial support by RFBR (Grant 16-02-00098) and President Grant for Government Support of the Leading Scientific Schools of the Russian Federation (NSh-2886.2014.2). . - ISSN 1557-1939. - ISSN 1557-1947
   Перевод заглавия: Однородное примесное рассеяние в двухзонных s± и s++ сверхпроводниках

РУБ Physics, Applied + Physics, Condensed Matter
Рубрики:
High-temperature superconductivity
Iron
Кл.слова (ненормированные):
Multiband superconductivity -- Impurity scattering -- Fe-based -- superconductors
Аннотация: The s ± and s ++ models for the superconducting state are subject of intense studies regarding Fe-based superconductors. Depending on the parameters, disorder may leave intact or suppress T c in these models. Here, we study the special case of disorder with equal values of intra- and interband impurity potentials in the two-band s ± and s ++ models. We show that this case can be considered as an isolated point and T c there has maximal damping for a wide range of parameters.

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Держатели документа:
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Svobodny Prospect 79, Krasnoyarsk 660041, Russia.
Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany.
RAS, PN Lebedev Phys Inst, Moscow 117901, Russia.

Доп.точки доступа:
Togushova, Yu. N.; Dolgov, O. V.; Коршунов, Максим Михайлович; RFBR [16-02-00098]; Leading Scientific Schools of the Russian Federation [NSh-2886.2014.2]
}
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