Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite MgCNi3 from Penetration Depth Measurements
Abstract
The London penetration depth, λ(T), was measured in polycrystalline powders of the non-oxide 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.
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