Intrinsic Coherence Length Anisotropy in Nickelates and Some Iron-Based Superconductors
Электронный научный архив УРФУ
Информация об архиве | Просмотр оригинала| Поле | Значение | |
| Заглавие |
Intrinsic Coherence Length Anisotropy in Nickelates and Some Iron-Based Superconductors
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| Автор |
Talantsev, E. F.
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| Тематика |
ANISOTROPY OF CHARACTERISTIC LENGTH IN SUPERCONDCUTORS
IRON-BASED SUPERCONDUCTORS NICKELATE SUPERCONDUCTORS SUPERCONDUCTING COHERENCE LENGTH 3D MODELING ANISOTROPY FILM THICKNESS GROUND STATE IRON COMPOUNDS IRON-BASED SUPERCONDUCTORS RARE EARTHS ANISOTROPY OF CHARACTERISTIC LENGTH IN SUPERCONDCUTOR CHARACTERISTIC LENGTH COHERENCE LENGTHS FILM THICKNESS FORMULAS NICKELATE SUPERCONDUCTOR NICKELATES SUPERCONDUCTING COHERENCE LENGTH SUPERCONDUCTING STATE TEMPERATURE DEPENDENT THIN-FILMS THIN FILMS |
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| Описание |
Nickelate superconductors, R1−xAxNiO2 (where R is a rare earth metal and A = Sr, Ca), experimentally discovered in 2019, exhibit many unexplained mysteries, such as the existence of a superconducting state with Tc (up to 18 K) in thin films and yet absent in bulk materials. Another unexplained mystery of nickelates is their temperature-dependent upper critical field, (Formula presented.), which can be nicely fitted to two-dimensional (2D) models; however, the deduced film thickness, (Formula presented.), exceeds the physical film thickness, (Formula presented.), by a manifold. To address the latter, it should be noted that 2D models assume that (Formula presented.) is less than the in-plane and out-of-plane ground-state coherence lengths, (Formula presented.) and (Formula presented.), respectively, and, in addition, that the inequality (Formula presented.) satisfies. Analysis of the reported experimental (Formula presented.) data showed that at least one of these conditions does not satisfy for R1-xAxNiO2 films. This implies that nickelate films are not 2D superconductors, despite the superconducting state being observed only in thin films. Based on this, here we propose an analytical three-dimensional (3D) model for a global data fit of in-plane and out-of-plane (Formula presented.) in nickelates. The model is based on a heuristic expression for temperature-dependent coherence length anisotropy: (Formula presented.), where (Formula presented.) is a unitless free-fitting parameter. The proposed expression for (Formula presented.), perhaps, has a much broader application because it has been successfully applied to bulk pnictide and chalcogenide superconductors. © 2023 by the author.
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| Дата |
2024-04-05T16:26:48Z
2024-04-05T16:26:48Z 2023 |
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| Тип |
Article
Journal article (info:eu-repo/semantics/article) |info:eu-repo/semantics/publishedVersion |
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| Идентификатор |
Talantsev, EF 2023, 'Intrinsic Coherence Length Anisotropy in Nickelates and Some Iron-Based Superconductors', Materials, Том. 16, № 12, 4367. https://doi.org/10.3390/ma16124367
Talantsev, E. F. (2023). Intrinsic Coherence Length Anisotropy in Nickelates and Some Iron-Based Superconductors. Materials, 16(12), [4367]. https://doi.org/10.3390/ma16124367 1996-1944 Final All Open Access, Gold, Green https://www.scopus.com/inward/record.uri?eid=2-s2.0-85163706295&doi=10.3390%2fma16124367&partnerID=40&md5=5317357c9c9f585428127dbcb6df0486 https://www.mdpi.com/1996-1944/16/12/4367/pdf?version=1687674236 http://elar.urfu.ru/handle/10995/130591 10.3390/ma16124367 85163706295 001018316000001 |
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| Язык |
en
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| Права |
Open access (info:eu-repo/semantics/openAccess)
cc-by https://creativecommons.org/licenses/by/4.0/ |
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| Формат |
application/pdf
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| Издатель |
MDPI
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| Источник |
Materials
Materials |
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