Magnetic impurity effects on the superconductivity of noncentrosymmetric LaNiC2: Ce substitution for La
Susumu Katano, Kohei Shibata, Kotaro Nakashima, Yohei Matsubara
DOI 10.1103/PhysRevB.95.144502 · Physical Review B
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Abstract
Effects of paramagnetic impurities on the superconducting transition of noncentrosymmetric LaNiC2 have been studied by Ce substitution for La up to 3 at.%. With the substitution the superconducting transition temperature Tc∼2.8 K of the pure system decreases dramatically, and disappears with Ce just above 2 at.%. This intense suppression of Tc with the Ce substitution can be explained by the Abrikosov-Gor'kov theory for conventional s-wave superconductors with localized magnetic moments. These results, together with a quite small depression of Tc with nonmagnetic Y impurities, strongly suggest that LaNiC2 is a BCS superconductor with a full superconducting energy gap, not an unconventional one with a nodal gap.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | unknown |
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | unknown |
| LaNiC2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.8 | Pressure unresolved | unknown |
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