Noncentrosymmetric superconductor BeAu

A. Amon, E. Svanidze, R. Cardoso-Gil, M. N. Wilson, H. Rosner, M. Bobnar, W. Schnelle, J. W. Lynn, R. Gumeniuk, C. Hennig, G. M. Luke, H. Borrmann, A. Leithe-Jasper, and Yu. Grin
Phys. Rev. B 97, 014501 – Published 4 January 2018

Abstract

Mixed spin-singlet and spin-triplet pairing can occur in noncentrosymmetric superconductors. In this respect, a comprehensive characterization of the noncentrosymmetric superconductor BeAu was carried out. It was established that BeAu undergoes a structural phase transition from a low-temperature noncentrosymmetric FeSi structure type to a high-temperature centrosymmetric structure in the CsCl type at Ts=860 K. The low-temperature modification exhibits a superconducting transition below Tc=3.3 K. The values of lower (Hc1=32 Oe) and upper (Hc2=335 Oe) critical fields are rather small, confirming that this type-II (κG-L=2.3) weakly coupled (λe-p=0.5,ΔCe/γnTc1.26) superconductor can be well understood within the Bardeen-Cooper-Schrieffer theory. The muon spin relaxation analysis indicates that the time-reversal symmetry is preserved when the superconducting state is entered, supporting conventional superconductivity in BeAu. From the density functional band structure calculations, a considerable contribution of the Be electrons to the superconducting state was established. On average, a rather small mass renormalization was found, consistent with the experimental data.

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  • Received 14 November 2017
  • Revised 7 December 2017

DOI:https://doi.org/10.1103/PhysRevB.97.014501

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

A. Amon1, E. Svanidze1, R. Cardoso-Gil1, M. N. Wilson2, H. Rosner1, M. Bobnar1, W. Schnelle1, J. W. Lynn3, R. Gumeniuk4, C. Hennig5, G. M. Luke2,6, H. Borrmann1, A. Leithe-Jasper1, and Yu. Grin1

  • 1Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Straße 40, 01187 Dresden, Germany
  • 2Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada L8S4M1
  • 3NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 4Technische Universität Bergakademie Freiberg, Institut für Experimentelle Physik, Leipziger Str. 23, 09596 Freiberg, Germany
  • 5Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstr. 400, 01328 Dresden, Germany
  • 6Canadian Institute for Advanced Research, Toronto, ON, Canada M5G1Z7

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Issue

Vol. 97, Iss. 1 — 1 January 2018

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