Low-Temperature Specific Heat of the Heavy-Fermion Superconductor [Formula presented]

R. Vollmer, A. Faißt, C. Pfleiderer, H. v. Löhneysen, E. D. Bauer, P. C. Ho, V. Zapf, M. B. Maple

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

We report the magnetic field dependence of the specific-heat [Formula presented] of single crystals of the first Pr-based heavy-fermion superconductor [Formula presented]. The variation of [Formula presented] at low temperature and the magnetic phase diagram inferred from [Formula presented], the resistivity and magnetization provide compelling evidence of a doublet ground state. Two distinct superconducting anomalies in [Formula presented] indicate an unconventional superconducting state, where the splitting may arise from a weak lifting of the ground state degeneracy. In combination this identifies [Formula presented] as a strong contender for quadrupolar pairing, i.e., superconductivity that is neither electron-phonon nor magnetically mediated.

Original languageEnglish
Pages (from-to)4
Number of pages1
JournalPhysical Review Letters
Volume90
Issue number5
DOIs
StatePublished - 2003
Externally publishedYes

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