Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite $\mathrm{MgCNi_3}$ from Penetration Depth Measurements

Details Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite $\mathrm{MgCNi_3}$ from Penetration Depth Measurements Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite $\mathrm{MgCNi_3}$ from Penetration Depth Measurements

2003-02-21

arxiv.org/abs/cond-mat/0302431v1

Phys. Rev. B (Rapid Communications) 68, 180502R (2003)

Physics

Condensed Matter

Superconductivity

4 pages, RevTex 4

Scientific paper

10.1103/PhysRevB.68.180502

The London penetration depth, $\lambda(T)$, was measured in polycrystalline
powders of the non-oxide perovskite superconductor $\mathrm{MgCNi_3}$ 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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