Journal of Alloys and Compounds, volume 927, pages 166970

Microscopic properties of Mo4Ga20Sb intermetallic superconductor in normal and superconducting states as evidenced by NMR and NQR spectroscopy

GIPPIUS A. A. ^{1, 2}

Gunbin A V

Iarygina D.A.

Tkachev A. V.

Zhurenko S. V.

Verchenko V. Yu.

Plenkin D.S.

Shevelkov Andrei V.

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Department of Physics, M.V. Lomonosov Moscow State University, 119991 Moscow, Russia |

P.N. Lebedev Physics Institute, 119991 Moscow, Russia |

Publication type: Journal Article

Publication date: 2022-12-01

Elsevier

Journal: Journal of Alloys and Compounds

Quartile SCImago

Quartile WOS

Impact factor: 6.2

ISSN: 09258388

DOI: 10.1016/j.jallcom.2022.166970

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Materials Chemistry

Metals and Alloys

Mechanical Engineering

Mechanics of Materials

Abstract

A detailed study of novel intermetallic superconductor Mo 4 Ga 20 Sb ( T c = 6.6 K) by means of 69,71 Ga nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) spectroscopy was performed to gain insight into the superconducting pairing mechanism and gap characteristics, as well as into the normal-state electronic properties on a microscopic scale. An unexpected step-like increase of the 69 Ga1 NQR linewidth was observed at T c with decreasing temperature, which may indicate coexistence of several superconducting phases on a microscopic scale with slightly different T c values. Above 140 K, the NQR linewidth decreases rapidly with increasing temperature due to possible oscillatory and/or rotational modes of the gallium cluster network at the elevated temperatures. Nuclear spin lattice relaxation rate 1/ T 1 of 69 Ga nuclei in the Ga1 position follows Korringa law characteristic for the compounds with good metallic conductivity. The calculated Korringa ratio S < 1 indicates the presence of antiferromagnetic correlations in Mo 4 Ga 20 Sb, in agreement with the magnetic susceptibility data. Below T c , a pronoun c ed intensive Hebel-Slichter peak was observed indicating s -wave superconductivity without point or line nodes in the k -space (full gap s -wave superconductivity). We have demonstrated that the best fit of the experimental data is achieved using two s -wave superconducting gaps of 13 K and 6 K with relative weights of 0.8 and 0.2, respectively. The obtained weighted average value of 11.6 K is consistent with the specific heat value of Δ = 12.05 K. • NQR linewidth grows with decreasing temperature, demonstrating a pronounced step at T C . • Hebel-Slichter peak below T C clearly evidences for the s-wave superconductivity. • Antiferromagnetic correlations were established both by the value of Korringa ratio and by the narrowing of Hebel-Slichter peak. • Two s -wave gaps model fits best to the experimental data with gaps of 13 K and 6 K. • Long period oscillations of the spin echo intensity with the frequency of ~ 2E4 rad/s were observed on spin-spin relaxation curves.

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GIPPIUS A. A. et al. Microscopic properties of Mo4Ga20Sb intermetallic superconductor in normal and superconducting states as evidenced by NMR and NQR spectroscopy // Journal of Alloys and Compounds. 2022. Vol. 927. p. 166970.

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GIPPIUS A. A., Gunbin A. V., Iarygina D., Tkachev A. V., Zhurenko S. V., Verchenko V. Y., Plenkin D., Shevelkov A. V. Microscopic properties of Mo4Ga20Sb intermetallic superconductor in normal and superconducting states as evidenced by NMR and NQR spectroscopy // Journal of Alloys and Compounds. 2022. Vol. 927. p. 166970.

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TY - JOUR

DO - 10.1016/j.jallcom.2022.166970

UR - https://doi.org/10.1016%2Fj.jallcom.2022.166970

TI - Microscopic properties of Mo4Ga20Sb intermetallic superconductor in normal and superconducting states as evidenced by NMR and NQR spectroscopy

T2 - Journal of Alloys and Compounds

AU - GIPPIUS, A. A.

AU - Gunbin, A V

AU - Iarygina, D.A.

AU - Tkachev, A. V.

AU - Zhurenko, S. V.

AU - Verchenko, V. Yu.

AU - Plenkin, D.S.

AU - Shevelkov, Andrei V.

PY - 2022

DA - 2022/12/01 00:00:00

PB - Elsevier

SP - 166970

VL - 927

SN - 0925-8388

ER -

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@article{2022_GIPPIUS,

author = {A. A. GIPPIUS and A V Gunbin and D.A. Iarygina and A. V. Tkachev and S. V. Zhurenko and V. Yu. Verchenko and D.S. Plenkin and Andrei V. Shevelkov},

title = {Microscopic properties of Mo4Ga20Sb intermetallic superconductor in normal and superconducting states as evidenced by NMR and NQR spectroscopy},

journal = {Journal of Alloys and Compounds},

year = {2022},

volume = {927},

publisher = {Elsevier},

month = {dec},

url = {https://doi.org/10.1016%2Fj.jallcom.2022.166970},

pages = {166970},

doi = {10.1016/j.jallcom.2022.166970}

}

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Publisher

Elsevier

Journal

Journal of Alloys and Compounds

Quartile SCImago

Quartile WOS

Impact factor

6.2

ISSN

09258388 (Print)

Labs

Solid State NMR Laboratory

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