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Single-gap superconductivity in Mo8Ga41
Miroslav Marcin1, Jozef Kačmarčík1, Zuzana Pribulová2
1Centre of Low Temperature Physics, Institute of Experimental Physics SAS, and Faculty of Science, P. J. Šafárik University, 040 01, Košice, Slovakia.
Abstract:
In this paper, the potential existence of two-gap superconductivity in Mo8Ga41 is addressed in detail by means of thermodynamic and spectroscopic measurements. A combination of highly sensitive bulk and surface probes, specifically ac-calorimetry and scanning tunneling spectroscopy (STS), are utilized on the same piece of crystal and reveal the presence of only one intrinsic gap in the system featuring strong electron-phonon coupling. Minute traces of additional superconducting phases detected by STS and also in the heat capacity measured in high magnetic fields on a high-quality and seemingly single-phase crystal might mimic the multigap superconductivity of Mo8Ga41 suggested recently in several studies.
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