Quasiparticle excitations and evidence for superconducting double transitions in monocrystalline U0.97Th0.03Be13

  title={Quasiparticle excitations and evidence for superconducting double transitions in monocrystalline U0.97Th0.03Be13},
  author={Yusei Shimizu and Shunichiro Kittaka and Shota Nakamura and Toshiro Sakakibara and Dai Aoki and Yoshiya Homma and Ai Nakamura and Kazushige Machida},
  journal={Physical Review B},
Superconducting (SC) gap symmetry and magnetic response of cubic U0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dc magnetization measurements using a single crystal, in order to address the long-standing question of its second phase transition at Tc2 in the SC state below Tc1. The absence (presence) of an anomaly at Tc2 in the field-cooling (zero-field-cooling) magnetization indicates that this transition is between two different SC states. There is a qualitative… 
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