Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13
- Author(s): Wälti, C;
- Felder, E;
- Ott, HR;
- Fisk, Z;
- Smith, JL
- et al.
Published Web Locationhttps://doi.org/10.1103/PhysRevB.63.100505
We report on measurements of the low-temperature specific heat Cp(T, B) of the unconventional superconductor UBe13 in magnetic fields up to 7 T. At B≈2 T, a substantial change in the magnetic-field dependence of the temperature derivative of the magnetic-field induced contribution to the electronic specific heat CH(T, B), resulting from the flow of supercurrents around the vortices, is observed, suggesting a crossover between two different regions in the superconducting phase diagram of UBe13. For fields B >2 T, CH(T, B) exhibits a scaling behavior with respect to TB-1/2, which provides substantial evidence for the existence of point nodes in the quasiparticle excitation spectrum of the superconductor.