Evidence for unconventional superconductivity in the nonoxide perovskite MgCNi3 from penetration depth measurements

R. Prozorov; A. Snezhko; T. He; R. J. Cava

doi:10.1103/PhysRevB.68.180502

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Evidence for unconventional superconductivity in the nonoxide perovskite MgCNi3 from penetration depth measurements

R. Prozorov, A. Snezhko, T. He, R. J. Cava

DOI 10.1103/PhysRevB.68.180502 · Physical Review B

T1

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Abstract

The London penetration depth λ(T) was measured in polycrystalline powders of the nonoxide perovskite superconductor MgCNi3 by using a sensitive tunnel-diode resonator technique. The penetration depth exhibits distinctly non s-wave BCS low-temperature behavior, instead showing quadratic temperature dependence, suggestive of a nodal order parameter.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgCNi3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	onset
MgC0.98Ni3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	onset