Magnetic-field-dependent pinning potential in LiFeAs superconductor from its Campbell penetration depth
Plengchart Prommapan, Makariy A. Tanatar, Bumsung Lee, Seunghyun Khim, Kee Hoon Kim, Ruslan Prozorov
DOI 10.1103/PhysRevB.84.060509 · Physical Review B
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Abstract
A theoretical critical current density jc(T,H), as opposite to commonly measured relaxed persistent (Bean) current jB, was extracted from the Campbell penetration depth λC(T,H) measured in single crystals of LiFeAs. The effective pinning potential is slightly nonparabolic, which follows from the magnetic-field-dependent Labusch parameter α. At the equilibrium (upon field cooling), α(H) is nonmonotonic, but it is monotonic at a finite gradient of the vortex density. Combined with the observation of a fishtail magnetization in standard dc measurements, this result implies that the fishtail appears as a result of magnetic relaxation. The functional form of M(H) curves is determined by the nonmonotonic pinning potential, implying the importance of vortex collective effects. The values of jc(2K)≃1.22×106A/cm2 provide an upper theoretical estimate of the current-carrying capability of LiFeAs. Overall, vortex behavior of almost isotropic fully gapped LiFeAs is very similar to highly anisotropic d-wave cuprate superconductors, the similarity that requires further studies in order to understand unconventional superconductivity in cuprates and pnictides.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 18 | Pressure not reported | onset |
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