Abstract
We report on measurements of the low-temperature specific heat ${C}_{p}(T,B)$ of the unconventional superconductor ${\mathrm{UBe}}_{13}$ in magnetic fields up to 7 T. At $B\ensuremath{\approx}2 \mathrm{T},$ a substantial change in the magnetic-field dependence of the temperature derivative of the magnetic-field induced contribution to the electronic specific heat ${C}_{H}(T,B),$ resulting from the flow of supercurrents around the vortices, is observed, suggesting a crossover between two different regions in the superconducting phase diagram of ${\mathrm{UBe}}_{13}.$ For fields $B>2\mathrm{}\mathrm{T},$ ${C}_{H}(T,B)$ exhibits a scaling behavior with respect to ${\mathrm{TB}}^{\ensuremath{-}1/2},$ which provides substantial evidence for the existence of point nodes in the quasiparticle excitation spectrum of the superconductor.
Highlights
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
The magnetic field induced contribution to the specific heat Cp(T,B) of a superconductor with gap-nodes strongly depends on the topology of these nodes, and measurements of the specific heat in external magnetic fields may directly serve as a tool for investigating the topology of the gap nodes
We demonstrate the existence of a crossover at BϷ2 T between two different regions in the phase diagram of UBe13 and we further demonstrate that for BϾ2 T, the behavior of CH(T,B) of the heavy-electron superconductor UBe13 as a function of T and B leads to the conclusion, that its superconducting energy gap exhibits point nodes
Summary
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. Title Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13 Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13
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