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- Title
Superconducting Stiffness and Coherence Length of FeSe 0.5 Te 0.5 Measured in a Zero-Applied Field.
- Authors
Peri, Amotz; Mangel, Itay; Keren, Amit
- Abstract
Superconducting stiffness ρ s and coherence length ξ are usually determined by measuring the penetration depth λ of a magnetic field and the upper critical field H c 2 of a superconductor (SC), respectively. However, in magnetic SC, which is iron-based, this could lead to erroneous results, since the internal field could be very different from the applied one. To overcome this problem in Fe 1 + y Se x Te 1 − x with x ∼ 0.5 and y ∼ 0 (FST), we measured both quantities with the Stiffnessometer technique. In this technique, one applies a rotor-free vector potential A to a superconducting ring and measures the current density j via the ring's magnetic moment m. ρ s and ξ are determined from London's equation, j = − ρ s A , and its range of validity. This method is particularly accurate at temperatures close to the critical temperature T c . We find weaker ρ s and longer ξ than existing literature reports, and critical exponents which agree better with expectations based on the Ginzburg–Landau theory.
- Subjects
LONDON (England); CRITICAL temperature; CRITICAL exponents; MAGNETIC moments; IRON-based superconductors; MAGNETIC fields
- Publication
Condensed Matter, 2023, Vol 8, Issue 2, p39
- ISSN
2410-3896
- Publication type
Article
- DOI
10.3390/condmat8020039