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One or two gaps in Mo8Ga41 superconductor? Local Hall-probe magnetometry study

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Medvecká,  Z.
Physics of Unconventional Metals and Superconductors, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Marcin, M., Pribulova, Z., Kacmarcik, J., Medvecká, Z., Klein, T., Verchenko, V. Y., et al. (2021). One or two gaps in Mo8Ga41 superconductor? Local Hall-probe magnetometry study. Superconductor Science and Technology, 34(3): 035017, pp. 1-5. doi:10.1088/1361-6668/abd5f3.


Cite as: http://hdl.handle.net/21.11116/0000-0008-100F-6
Abstract
The magnetization properties of the endohedral cluster superconductor Mo8Ga41 are studied by sensitive Hall-probe magnetometry. The temperature dependence of the lower critical magnetic field H-c1 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-c1 field is reflected in magnetization measurements which could lead to misinterpretation of the multigap superconductivity in Mo8Ga41.