Intermetallics, volume 163, pages 108063
Inherent surface superconducting phase in the Mo8Ga41 single-gap bulk superconductor as seen by nuclear resonance and tunneling spectroscopy
GIPPIUS A. A.
1, 2
,
Gunbin A V
2
,
Tkachev A. V.
2
,
Zhurenko S. V.
2
,
Fazlizhanova D.I.
3, 4
,
Kuzmichev S.A.
1, 2
,
Kuzmicheva T. E.
2
,
Verchenko V. Yu.
5
,
Publication type: Journal Article
Publication date: 2023-12-01
Materials Chemistry
Metals and Alloys
General Chemistry
Mechanical Engineering
Mechanics of Materials
Abstract
A comprehensive study of the intermetallic superconductor Mo8Ga41 was conducted by means of HRPXRD, ab-initio calculations, NMR and NQR spectroscopy on 69Ga and 71Ga nuclei, as well as tunneling spectroscopy. All experimental methods used demonstrated the presence of an inherent surface superconducting phase in addition to the bulk superconducting phase. For the latter, the s-wave type single-gap superconducting behavior was observed with a slightly increased 2Δ0/kBTc = 3.89 in agreement with the known enhanced electron-phonon coupling in this compound. From nuclear spin-lattice relaxation experiment, the estimated superconducting gap value of the surface phase was 2Δ*0 = 22.2 K, which corresponds to the T*c ≈ 6.3 K in the weak-coupling BCS limit. Meanwhile, the tunneling spectroscopy reveals similar values of T*c ∼ 6.0–7.3 K for this surface phase. Thus, the known evidence of the Mo8Ga41 multi-gap behavior can be explained by the influence of the inherent surface superconducting phase.
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GIPPIUS A. A. et al. Inherent surface superconducting phase in the Mo8Ga41 single-gap bulk superconductor as seen by nuclear resonance and tunneling spectroscopy // Intermetallics. 2023. Vol. 163. p. 108063.
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GIPPIUS A. A., Gunbin A. V., Tkachev A. V., Zhurenko S. V., Fazlizhanova D., Kuzmichev S., Kuzmicheva T. E., Verchenko V. Y., Shevelkov A. V. Inherent surface superconducting phase in the Mo8Ga41 single-gap bulk superconductor as seen by nuclear resonance and tunneling spectroscopy // Intermetallics. 2023. Vol. 163. p. 108063.
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TY - JOUR
DO - 10.1016/j.intermet.2023.108063
UR - https://doi.org/10.1016%2Fj.intermet.2023.108063
TI - Inherent surface superconducting phase in the Mo8Ga41 single-gap bulk superconductor as seen by nuclear resonance and tunneling spectroscopy
T2 - Intermetallics
AU - GIPPIUS, A. A.
AU - Gunbin, A V
AU - Tkachev, A. V.
AU - Zhurenko, S. V.
AU - Fazlizhanova, D.I.
AU - Kuzmichev, S.A.
AU - Kuzmicheva, T. E.
AU - Verchenko, V. Yu.
AU - Shevelkov, Andrei V.
PY - 2023
DA - 2023/12/01 00:00:00
PB - Elsevier
SP - 108063
VL - 163
SN - 0966-9795
ER -
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@article{2023_GIPPIUS,
author = {A. A. GIPPIUS and A V Gunbin and A. V. Tkachev and S. V. Zhurenko and D.I. Fazlizhanova and S.A. Kuzmichev and T. E. Kuzmicheva and V. Yu. Verchenko and Andrei V. Shevelkov},
title = {Inherent surface superconducting phase in the Mo8Ga41 single-gap bulk superconductor as seen by nuclear resonance and tunneling spectroscopy},
journal = {Intermetallics},
year = {2023},
volume = {163},
publisher = {Elsevier},
month = {dec},
url = {https://doi.org/10.1016%2Fj.intermet.2023.108063},
pages = {108063},
doi = {10.1016/j.intermet.2023.108063}
}