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

Yusei Shimizu, Shunichiro Kittaka, Shota Nakamura, Toshiro Sakakibara, Dai Aoki, Yoshiya Homma, Ai Nakamura, Kazushige Machida

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22 Citations (Scopus)

Abstract

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 difference in the field variation of the transition temperatures; Tc2(H) is isotropic, whereas Tc1(H) exhibits a weak anisotropy between the [001] and [111] directions. In the low-temperature phase below Tc2(H), the angle-resolved heat capacity C(T,H,φ) reveals that the gap is fully opened over the Fermi surface, narrowing down the possible gap symmetry.

Original languageEnglish
Article number100505
JournalPhysical Review B
Volume96
Issue number10
DOIs
Publication statusPublished - 2017 Sep 18

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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