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Article Dans Une Revue Superconductor Science and Technology Année : 2021

One or two gaps in Mo 8 Ga 41 superconductor? Local Hall-probe magnetometry study

Résumé

Abstract The magnetization properties of the endohedral cluster superconductor Mo 8 Ga 41 are studied by sensitive Hall-probe magnetometry. The temperature dependence of the lower critical magnetic field H c 1 is obtained and compared to theoretical models accounting for single-gap and two-gap superconductivity. Data can be described by both models with minor differences. These results are confronted with our previous measurements which evidence that the system is inherently single-gap s -wave superconductor but minor additional phases are present also in seemingly perfect samples. We discuss how presence of such additional phases with varying size of the penetration depth and H c 1 field is reflected in magnetization measurements which could lead to misinterpretation of the multigap superconductivity in Mo 8 Ga 41 .
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Dates et versions

hal-04155865 , version 1 (07-07-2023)

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M Marcin, Z Pribulová, J Kačmarčík, Z Medvecká, T Klein, et al.. One or two gaps in Mo 8 Ga 41 superconductor? Local Hall-probe magnetometry study. Superconductor Science and Technology, 2021, 34 (3), pp.035017. ⟨10.1088/1361-6668/abd5f3⟩. ⟨hal-04155865⟩

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