Evidence for Unconventional Superconductivity in the Non-Oxide Perovskite $\mathrm{MgCN}{\mathrm{i}}_3$ from Penetration Depth Measurements

Abstract

The London penetration depth, $\lambda (T)$, was measured in polycrystalline powders of the non-oxide perovskite superconductor $\mathrm{MgCN}{\mathrm{i}}_3$ 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.

arXiv comment4 pages, RevTex 4

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Cited by in corpus (15)

• Magnetic Penetration Depth in Unconventional Superconductors
• New anti-perovskite-type Superconductor ZnNyNi3
• Evidence for strong electron-phonon coupling in MgCNi_3
• Carbon isotope effect in superconducting MgCNi_3
• Theoretical search for superconductivity in Sc3XB perovskites and weak ferromagnetism in Sc3X (X = Tl, In, Ga, Al)
• Competition between the BCS superconductivity and ferromagnetic spin fluctuations in MgCNi${}_3$
• Conventional superconductivity and hysteretic Campbell penetration depth in single crystals MgCNi${}_3$
• S-wave superconductivity probed by measuring magnetic penetration depth and lower critical field of MgCNi${}_3$ single crystals
• Competition of ferromagnetism and superconductivity in Sc3InB
• Role of C in MgC_xNi_3 investigated from first principles
• Superconducting energy gap in MgCNi3 single crystals: Point-contact spectroscopy and specific-heat measurements
• The Effect of Ru substitution for Ni on the superconductivity in MgCNi3-xRux
• Vacancies, disorder-induced smearing of the electronic structure, and its implications for the superconductivity of anti-perovskite MgC${}_{0.93}$Ni${}_{2.85}$
• Evidence for s-wave pairing from measurement on lower critical field in $MgCN{i}_3$
• Superconductivity in the vicinity of ferromagnetism in oxygen free perovskite MgCNi3: An experimental and DFT (Density Functional Theory) study