Detection of a Spin-Triplet Superconducting Phase in Oriented Polycrystalline U2PtC2 Samples Using Pt195 Nuclear Magnetic Resonance
A. M. Mounce, H. Yasuoka, G. Koutroulakis, N. Ni, E. D. Bauer, F. Ronning, J. D. Thompson
DOI 10.1103/PhysRevLett.114.127001 · Physical Review Letters
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Abstract
Nuclear magnetic resonance (NMR) measurements on the Pt195 nucleus in an aligned powder of the moderately heavy-fermion material U2PtC2 are consistent with spin-triplet pairing in its superconducting state. Across the superconducting transition temperature and to much lower temperatures, the NMR Knight shift is temperature independent for field both parallel and perpendicular to the tetragonal c axis, expected for triplet equal-spin pairing superconductivity. The NMR spin-lattice relaxation rate 1/T1, in the normal state, exhibits characteristics of ferromagnetic fluctuations, compatible with an enhanced Wilson ratio. In the superconducting state, 1/T1 follows a power law with temperature without a coherence peak giving additional support that U2PtC2 is an unconventional superconductor. Bulk measurements of the ac susceptibility and resistivity indicate that the upper critical field exceeds the Pauli limiting field for spin-singlet pairing and is near the orbital limiting field, an additional indication for spin-triplet pairing.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| U2PtC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.47 | Pressure not reported | unknown |
| U2PtC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.47 | Pressure not reported | unknown |
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