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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Romanova O. B., Янушкевич, Казимир Иосифович
Заглавие : Magnetoresistance effect in anion-substituted manganese chalcogenides
Место публикации : Phys. Status Solidi B. - 2015. - Vol. 252, Is. 8. - P.1792-1798. - ISSN 0370, DOI 10.1002/pssb.201451607. - ISSN 15213951 (eISSN)
Примечания : Cited References: 35. - This study was supported by the official assignment no. 114090470016.
Предметные рубрики: MAGNETIC-PROPERTIES
ELECTRONIC-STRUCTURE
SOLID-SOLUTIONS
MnTe
MnSe
CONDUCTIVITY
TRANSITION
Ключевые слова (''Своб.индексиров.''): electron tunneling--magnetic properties--magnetoresistance--semiconductors
Аннотация: The electric and magnetic properties of anion-substituted antiferromagnetic MnSe1-xTex (0.1≤x≤0.4) semiconductors in the 77-700K temperature range and magnetic fields under 1T are studied. In the MnSe1-xTex solid solutions, negative magnetoresistance in the vicinity of the Néel temperature for x=0.1 and for composition with x=0.2 in the paramagnetic range below 270K is revealed. A dependence of the magnetic susceptibility versus the prehistory of the samples is found. The model of localized spin-polarized electrons with the localization radius depending on the magnetic field is proposed for x=0.1. In the paramagnetic range, the negative magnetoresistance and the behavior of magnetic moment are a result of orbital glass formation.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Romanova O. B., Sitnikov M. N., Loginov Yu. Yu., Abdelbaki H.
Заглавие : Concentration dependences of the structural, magnetic and kinetic properties of manganese chalcogenides doped with tellurium
Коллективы : Reshetnev Readings 2019
Место публикации : IOP Conf. Ser.: Mater. Sci. Eng. - 2022. - Vol. 1230. - Ст.012016. - ISSN 1757-8981 (ISSN), DOI 10.1088/1757-899X/1230/1/012016. - ISSN 1757-899X (eISSN)
Примечания : Cited References: 26. - The reported study was funded by RFBR according to the research project No 20-52-00005 Bel_a
Аннотация: The effect of anionic substitution on the structural, magnetic, and kinetic properties of chalcogenides of the MnSe1-XTeX system in the temperature range of 77-400K in magnetic fields up to 12 kOe was studied. With an increase in the substitution concentration, changes in the structural and magnetic characteristics, which correlate with changes in the electronic structure, were found. The type and mobility of the main current carriers were determined from the Hall effect measurements.
https://doi.org/10.1088/1757-899X/1230/1/012016
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ruseikina A. V., Solovyov L. A., Molokeev M. S., Andreev O. V.
Заглавие : Crystal structures of EuLnCuS3 (Ln = Nd and Sm)
Место публикации : Russ. J. Inorg. Chem.: MAIK Nauka-Interperiodica / Springer, 2012. - Vol. 57, Is. 1. - P.79-83. - ISSN 0036-0236, DOI 10.1134/S0036023612010172
Примечания : This work was supported by the Federal Target Program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013 (grant nos. 6K/143-09 (P 646) and NK-409/5 (P2263)) and the President of the Russian Federation (Support Program for Leading Scientific Schools of the Russian Federation, grant NSh-4645.2010.2).The results of this study have been presented at the X International Scientific Conference “Solid-State Chemistry: Nanomaterials, Nanotechnologies” (Stavropol, October 17–22, 2010) and the All-Russia Scientific Conference “Challenges of Modern Chemistry. Theory and Practice” (Ufa, October 21–23, 2010).
Предметные рубрики: RARE-EARTH
MAGNETIC-PROPERTIES
COPPER SULFIDE
CHALCOGENIDES
EUROPIUM
EU2CUS3
Аннотация: The compound sulfides EuLnCuS3 (Ln = Nd and Sm) were obtained for the first time. Their crystal structures were determined from X-ray powder diffraction data. The crystals of both compounds are orthorhombic (space group Pnma). The compound EuNdCuS3 is isostructural with BaLaCuS3; the unit cell parameters are a = 11.0438(2) Å, b = 4.0660(1) Å, c = 11.4149(4) Å. The compound EuSmCuS3 is isostructural with Eu2CuS3; the unit cell parameters are a = 10.4202(2) Å, b = 3.9701(1) Å, c = 12.8022(2) Å.
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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) : Shestakov V. A., Korshunov M. M., Togushova Yu.N., Efremov D. V., Dolgov O. V.
Заглавие : Details of the disorder-induced transition between s± and s++ states in the two-band model for Fe-based superconductors
Коллективы : Russian Foundation for Basic Research [16-02-00098]; Government Support of the Leading Scientific Schools of the Russian Federation [NSh-7559.2016.2]; 'BASIS' Foundation for Development of Theoretical Physics and Mathematics
Место публикации : Supercond. Sci. Technol. - 2018. - Vol. 31, Is. 3. - Ст.034001. - ISSN 0953-2048, DOI 10.1088/1361-6668/aaa501. - ISSN 1361-6668(eISSN)
Примечания : Cited References:62. - We are grateful to P D Grigor'ev and M V Sadovskii for useful discussions. This work was supported in part by the Russian Foundation for Basic Research (grant 16-02-00098) and Government Support of the Leading Scientific Schools of the Russian Federation (NSh-7559.2016.2). MMK and VAS acknowledge the support of the 'BASIS' Foundation for Development of Theoretical Physics and Mathematics.
Предметные рубрики: IRON-BASED SUPERCONDUCTORS
HIGH-TEMPERATURE SUPERCONDUCTIVITY
PAIRING
Ключевые слова (''Своб.индексиров.''): unconventional superconductors--iron pnictides--iron chalcogenides--impurity scattering
Аннотация: IIrradiation of superconductors with different particles is one of many ways to investigate the effects of disorder. Here we study the disorder-induced transition between s ± and s ++ states in the two-band model for Fe-based superconductors with nonmagnetic impurities. Specifically, we investigate the important question of whether the superconducting gaps during the transition change smoothly or abruptly. We show that the behavior can be of either type and is controlled by the ratio of intraband to interband impurity scattering potentials, and by a parameter σ, that represents scattering strength and ranges from zero (Born approximation) to one (unitary limit). For the pure interband scattering potential and the scattering strength σ ≲ 0.11, the s ± → s ++ transition is accompanied by steep changes in the gaps, while for larger values of σ, the gaps change smoothly. The behavior of the gaps is characterized by steep changes at low temperatures, T˂ 0.1Tc0 with Tc0 being the critical temperature in the clean limit, otherwise it changes gradually. The critical temperature Tc is always a smooth function of the scattering rate in spite of the steep changes in the behavior of the gaps.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Azarapin N. O., Oreshonkov A. S., Razumkova I. A., Aleksandrovsky A. S., Maximov N. G., Leonidov I. I., Shestakov N. P., Andreev O. V.
Заглавие : Evolution of structural, thermal, optical, and vibrational properties of Sc2S3, ScCuS2, and BaScCuS3 semiconductors
Коллективы : Ministry of Science and Higher Education of the Russian Federation [05.594.21.0019, UIN RFME-FI59420X0019]; ISSC UB RAS [AAAA-A19-119031890025-9]
Место публикации : Eur. J. Inorg. Chem. - 2021. - Vol. 2021, Is. 33. - P.3355-3366. - ISSN 1434-1948, DOI 10.1002/ejic.202100292. - ISSN 1099-0682(eISSN)
Примечания : Cited References: 50. - The work was partially carried out using the resources of the Research Resource Center "Natural Resources Management and Physico-Chemical Research" (Tyumen University) with financial support from the Ministry of Science and Higher Education of the Russian Federation (contract No. 05.594.21.0019, UIN RFMEFI59420X0019). The Raman spectroscopic studies were carried out at the collaborative research center for vibrational spectroscopy at ISSC UB RAS (Ekaterinburg, Russia). I.I.L. would like to acknowledge the support from the Research Program No. AAAA-A19-119031890025-9 (ISSC UB RAS). The use of the equipment of Krasnoyarsk Regional Center of Research Equipment of the Federal Research Center "Krasnoyarsk Science Center SB RAS" is acknowledged." The authors are grateful to Dr. Elena V. Vladimirova (ISSC UB RAS) for technical assistance
Предметные рубрики: RARE-EARTH
QUATERNARY CHALCOGENIDES
CRYSTAL-STRUCTURES
Аннотация: In the present work, we report on the synthesis of Sc2S3, ScCuS2 and BaScCuS3 powders using a method based on oxides sulfidation and modification of their properties. The crystal structures and morphology of samples are verified by XRD and SEM techniques. Thermal stability has been studied by DTA which has revealed that Sc2S3 decomposes to ScS through melting at 1877 K. ScCuS2 and BaScCuS3 melt incongruently at temperatures of 1618 K and 1535 K, respectively. The electronic structure calculations show that the investigated compounds are semiconductors with indirect band gap (Eg). According to the diffuse reflection spectroscopy, Sc2S3, ScCuS2 and BaScCuS3 are wide-bandgap semiconductors featured the Eg values of 2.53 eV, 2.05 eV and 2.06 eV, respectively. The band gap decreases with the introduction of copper (I) and barium cations into the crystal structure of the compounds. Variation of local structure has been verified by Raman and infrared spectroscopy. The calculated vibrational modes of ScCuS2 correspond to CuS4 and Sc−S layer vibrations, even though ScS6 octahedra-like structural units can be found in the structure.
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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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Вид документа : Статья из сборника (однотомник)
Шифр издания :
Автор(ы) : Korshunov M. M., Shestakov V. A., Togushova Yu.N.
Заглавие : Spin resonance peak in the superconducting state of iron pnictides and chalcogenides
Коллективы : International Conference on Solid Compounds of Transition Elements
Место публикации : The 21st International Conference on Solid Compounds of Transition Elements (SCTE 18)/ programme and abstracts. - 2018. - Ст.Tu-A15. - P.48
Аннотация: Disorder can result in interesting and sometimes unexpected effects in multiband superconductors. Especially if the superconductivity is unconventional like in ironbased pnictides and chalcogenides. I’m going to discuss how the impurity scattering affects superconducting states with s+- and s++ gaps, and show that disorder causes the transitions between s+- and s++ states and examine observable effects these transitions can produce.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Isaenko L., Dong L., Kurus A., Lin Z., Yelisseyev A., Lobanov S., Molokeev M. S., Korzhneva K., Goloshumova A.
Заглавие : LixAg1–xGaSe2: interplay between lithium and silver in mid-infrared nonlinear optical chalcogenides
Место публикации : Adv. Opt. Mater. - 2022. - Vol. 10, Is. 24. - Ст.2201727. - ISSN 21951071 (ISSN), DOI 10.1002/adom.202201727
Примечания : Cited References: 37. - This work was supported by the National Natural Science Foundation of China (Grant No. 22133004), Russian Science Foundation, grant # 19‐12‐00085‐P (crystal growth, crystal structure analysis, band gap measurement) and partly done on state assignment of IGM SB RAS (composition chemical analysis)
Аннотация: AgGaSe2 and LiGaSe2 are two famous mid-infrared nonlinear optical (NLO) materials with similar chemical formula but different structural symmetry. The former material has relatively larger NLO effect and birefringence but rather small energy band gap, while the latter is the opposite. Aiming at achieving a good balance of NLO properties, here the substitution between silver and lithium ions on the evolution of structural and optical properties in a new series of LixAg1–xGaSe2 crystals is systematically investigated. It reveals that, with the increase of Li content, LixAg1–xGaSe2 almost keeps the same tetragonal symmetry with AgGaSe2 until x ≈ 0.9. The NLO effects and birefringence values vary with respect to x with the largest variation at x = 0.8–0.9. The optimal combination of birefringence (0.03–0.025) and nonlinear parameters (26–30 pm V−1) is achieved at x = 0.4–0.5. As the energy band gap increases with the increase of x, the maximal value of 2.2 eV for chalcopyrite structure suggests that the laser-induced damage threshold of LixAg1–xGaSe2 would be as large as five-fold of AgGaSe2. This study provides a good example to show that the rational substitution between Li and Ag can significantly improve the balance of NLO properties in chalcogenides.
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10.

Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Berry F. J., Dmitrieva T. V., Ovanesyan N. S., Lyubutin I. S., Thomas M. F., Sarkisyan V. A., Ren X., Aminov T. G., Shabunina G. G., Rudenko V., Vorotynov A. M., Dubinskaya Y. L.
Заглавие : Magnetic order in FeCr2S4-type chalcogenide spinels
Место публикации : J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2007. - Vol. 19, Is. 26. - Ст.266204. - ISSN 0953-8984, DOI 10.1088/0953-8984/19/26/266204
Примечания : Cited References: 15
Предметные рубрики: COLOSSAL-MAGNETORESISTANCE
TRANSITION
Ключевые слова (''Своб.индексиров.''): doping (additives)--iron compounds--magnetization--magnetoresistance--mossbauer spectroscopy--x ray absorption fine structure spectroscopy--chalcogenide spinels--low temperature magnetic behaviour--magnetic ordering temperature--thiospinels--chalcogenides
Аннотация: The thiospinels of composition FeCr2S4 and Fe1+xCr2-2xSnxS4 with 0 x 0.1 have been examined by means of extended x- ray absorption fine structure, Mossbauer spectroscopy and magnetoresistance techniques. The structural characterization shows that tin enters the spinel- related lattice as Sn4+ and occupies the octahedral B site. Appreciable magnetoresistance is observed in the temperature range 160 - 185 K which includes the magnetic ordering temperature. The effect of slight non- stoichiometry in FeCr2S4 and of tin doping is observed in the M r ossbauer spectra which show the Fe2+ ions to occupy the tetrahedral A sites. The M r ossbauer spectra recorded around the magnetic ordering temperature are sensitive to small ( 0.03 T) applied magnetic fields. The influence of tin on the low temperature magnetic behaviour is associated with the distribution of Cr3+, Sn4+ and Fe3+ ions around tetrahedral Fe2+ sites and vacancies in the anionic sublattice. An interpretation of the colossal magnetoresistance phenomena below TN is suggested.
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