Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13

Ch. Wälti; E. Felder; H. R. Ott; Z. Fisk; J. L. Smith

doi:10.1103/PhysRevB.63.100505

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Scaling properties of the magnetic-field-induced specific heat of superconducting UBe13

Ch. Wälti, E. Felder, H. R. Ott, Z. Fisk, J. L. Smith

DOI 10.1103/PhysRevB.63.100505 · Physical Review B

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Abstract

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>2T, 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.91	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown