Exotic superconductivity in noncentrosymmetric and magnetic CeNiC2 revealed under high pressure
Susumu Katano, Masayuki Ito, Kohei Shibata, Jun Gouchi, Yoshiya Uwatoko, Kazuyuki Matsubayashi, Hideto Soeda, Hiroki Takahashi
DOI 10.1103/PhysRevB.99.100501 · Physical Review B
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Abstract
We have found that magnetically ordered noncentrosymmetric CeNiC2 exhibits superconductivity under very high pressures of near 11 GPa. The transition temperature Tc is 3.5 K, the highest in all Ce heavy-fermion superconductors, implying quite strong electron pairings with a high-energy scale. Several physical quantities show diverging features of a quantum phase transition, however, its criticality appears in a rather narrow range of pressure. The upper critical field μ0Hc2(T=0) is estimated to be 18 T, much higher than the Pauli paramagnetic limiting field of 6.5 T, indicating spin-triplet electron pairings correlated with its noncentrosymmetric structure.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | 11 GPa | onset |
| CeNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | 11 GPa | onset |
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure unresolved | unknown |
| CePt3Si Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.6 | Pressure not reported | unknown |
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