TY  - JOUR
PB  - SciPost Foundation
DO  - 10.21468/SciPostPhys.17.4.117
TI  - Conventional single-gap $s-$wave superconductivity and hidden peak effect in single crystals of Mo$_8$Ga$_{41}$ superconductor
PY  - 2024/10/21
UR  - https://scipost.org/SciPostPhys.17.4.117
JF  - SciPost Physics
JA  - SciPost Phys.
VL  - 17
IS  - 4
SP  - 117
A1  - Ghimire, Sunil
AU  - Cho, Kyuil
AU  - Joshi, Kamal R.
AU  - Tanatar, Makariy
AU  - Hu, Zhixiang
AU  - Petrovic, Cedomir
AU  - Prozorov, Ruslan
AB  - London and Campbell penetration depths were measured in single crystals of the endohedral gallide cluster superconductor, Mo$_8$Ga$_41$. The full temperature range superfluid density, $\rho_s(T)$, 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, $j_{c}(H)$, reveals an unusual result. While in the ZFC protocol, $j_{c}(H)$ 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.
ER  -

@Article{10.21468/SciPostPhys.17.4.117,
	title={{Conventional single-gap $s-$wave superconductivity and hidden peak effect in single crystals of Mo$_8$Ga$_{41}$ superconductor}},
	author={Sunil Ghimire and Kyuil Cho and Kamal R. Joshi and Makariy A. Tanatar and Zhixiang Hu and Cedomir Petrovic and Ruslan Prozorov},
	journal={SciPost Phys.},
	volume={17},
	pages={117},
	year={2024},
	publisher={SciPost},
	doi={10.21468/SciPostPhys.17.4.117},
	url={https://scipost.org/10.21468/SciPostPhys.17.4.117},
}