Intrinsic Coherence Length Anisotropy in Nickelates and Some Iron-Based Superconductors

Nickelate superconductors, R A NiO (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 (up to 18 K) in thin films and yet absent in bulk materials. Another unexplained mystery of...

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Bibliographic Details
Published in:Materials 2023-06, Vol.16 (12), p.4367
Main Author: Talantsev, Evgeny F
Format: Article
Language:English
Subjects:
Anisotropy
Calcium
Coherence length
Critical field (superconductivity)
Electrons
Film thickness
Group 5A compounds
Rare earth elements
Superconductivity
Superconductors
Temperature
Temperature dependence
Thin films
Three dimensional analysis
Three dimensional models
Two dimensional models
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Summary:Nickelate superconductors, R A NiO (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 (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, Bc2(T), which can be nicely fitted to two-dimensional (2D) models; however, the deduced film thickness, dsc,GL, exceeds the physical film thickness, dsc, by a manifold. To address the latter, it should be noted that 2D models assume that dsc is less than the in-plane and out-of-plane ground-state coherence lengths, dsc
ISSN:1996-1944
1996-1944
DOI:10.3390/ma16124367