Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13 - art. no. 100505

We report on measurements of the low-temperature specific heat C-p(T,B) of the unconventional superconductor UBe13 in magnetic fields up to 7 T. At B approximate to2 T, a substantial change in the magnetic-field dependence of the temperature derivative of the magnetic-field induced contribution to t he electronic specific heat C-H(T,B), resulting from the flow of supercurre nts around the vortices, is observed, suggesting a crossover between two di fferent regions in the superconducting phase diagram of UBe13. For fields B >2 T, C-H(T,B) exhibits a scaling behavior with respect to TB-1/2, which pr ovides substantial evidence for the existence of point nodes in the quasipa rticle excitation spectrum of the superconductor.