Conventional single-gap s−wave superconductivity and hidden peak effect in single crystals of Mo8Ga41 superconductor
Sunil Ghimire, Kyuil Cho, Kamal R. Joshi, Makariy A. Tanatar, Zhixiang Hu, Cedomir Petrovic, Ruslan Prozorov
SciPost Phys. 17, 117 (2024) · published 21 October 2024
- doi: 10.21468/SciPostPhys.17.4.117
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Abstract
London and Campbell penetration depths were measured in single crystals of the endohedral gallide cluster superconductor, Mo8Ga41. The full temperature range superfluid density, ρs(T), is consistent with the clean isotropic s−wave weak-coupling BCS theory without any signs of the second gap or strong coupling. The temperature dependence of the Campbell length is hysteretic between zero-field cooling (ZFC) and field-cooling (FC) protocols, indicating an anharmonic vortex pinning potential. The field dependence of the effective critical current density, jc(H), reveals an unusual result. While in the ZFC protocol, jc(H) is monotonically suppressed by the magnetic field, it exhibits a profound "hidden" peak effect in the FC protocol, that is, without a vortex density gradient. We suggest a possible novel mechanism for such a peak effect, which involves both static and dynamic aspects of vortex pinning.
Authors / Affiliations: mappings to Contributors and Organizations
See all Organizations.- 1 2 Sunil Ghimire,
- 1 2 Kyuil Cho,
- 1 2 Kamal R. Joshi,
- 1 2 Makariy Tanatar,
- 3 4 Zhixiang Hu,
- 3 4 5 6 Cedomir Petrovic,
- 1 2 Ruslan Prozorov
- 1 Iowa State University [ISU]
- 2 Ames Laboratory
- 3 Brookhaven National Laboratory [BNL]
- 4 Stony Brook University [SUNY Stony Brook]
- 5 中国科学院 / Chinese Academy of Sciences [CAS]
- 6 Универзитет у Београду / University of Belgrade