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Superconducting (SC) gap symmetry and magnetic response of cubicU0.97Th0.03Be13 are studied by means of high-precision heat-capacity and dcmagnetization measurements using a single crystal, in order to address thelong-standing question of its second phase transition at Tc2 in the SC statebelow Tc1. The absence (presence) of an anomaly at Tc2 in the field-cooling(zero-field-cooling) magnetization indicates that this transition is betweentwo different SC states. There is a qualitative difference in the fieldvariation of the transition temperatures; Tc2(H) is isotropic whereas Tc1(H)exhibits a weak anisotropy between [001] and [111] directions. In the lowtemperature phase below Tc2(H), the angle-resolved heat-capacity $C(T,H, \phi)$reveals that the gap is fully opened over the Fermi surface, narrowing down thepossible gap symmetry.

Quasiparticle Excitations and Evidence for Superconducting Double Transitions in Monocrystalline U0.97Th0.03Be13