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 language | English |
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Pages (from-to) | 4 |
Number of pages | 1 |
Journal | Physical Review Letters |
Volume | 90 |
Issue number | 5 |
DOIs | |
State | Published - 2003 |
Externally published | Yes |