μSR and magnetometry study of the type-I superconductor BeAu Academic Article uri icon

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abstract

  • We present muon spin rotation and relaxation (muSR) measurements as well as demagnetising field corrected magnetisation measurements on polycrystalline samples of the noncentrosymmetric superconductor BeAu. From muSR measurements in a transverse field, we determine that BeAu is a type-I superconductor with Hc = 256 Oe, amending the previous understanding of the compound as a type-II superconductor. To account for demagnetising effects in magnetisation measurements, we produce an ellipsoidal sample, for which a demagnetisation factor can be calculated. After correcting for demagnetising effects, our magnetisation results are in agreement with our muSR measurements. Using both types of measurements we construct a phase diagram from T = 30 mK to Tc = 3.25 K. We then study the effect of hydrostatic pressure and find that 450 MPa decreases Tc by 34 mK, comparable to the change seen in type-I elemental superconductors Sn, In and Ta, suggesting BeAu is far from a quantum critical point accessible by the application of pressure.

authors

  • Beare, J
  • Nugent, M
  • Wilson, MN
  • Cai, Y
  • Munsie, TJS
  • Amon, A
  • Leithe-Jasper, A
  • Gong, Z
  • Guo, SL
  • Guguchia, Z
  • Grin, Y
  • Uemura, YJ
  • Svanidze, E
  • Luke, Graeme

publication date

  • April 11, 2019