In this paper, potential two-gap superconductivity in Mo8Ga41 is addressed in detail by means of thermodynamic and spectroscopic measurements. Combination of highly sensitive ac-calorimetry and scanning tunneling spectroscopy (STS), as bulk and surface sensitive probes, utilized on the same piece of crystal reveals that there is only one intrinsic gap in the system featuring strong electron-phonon coupling. Traces of multiple superconducting phases seen 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.
@article{arxiv.1810.02556,
title = {Single-gap superconductivity in Mo$_8$Ga$_{41}$},
author = {M. Marcin and J. Kačmarčík and Z. Pribulová and M. Kopčík and P. Szabó and O. Šofranko and T. Samuely and V. Vaňo and C. Marcenat and V. Yu. Verchenko and A. V. Shevelkov and P. Samuely},
journal= {arXiv preprint arXiv:1810.02556},
year = {2019}
}