Evidence for two-gap superconductivity in the non-centrosymmetric compound LaNiC
2

Chen, J.; Jiao, L.; Zhang, J. L.; Chen, Y.; Yang, L.; Nicklas, M.; Steglich, F.; Yuan, H. Q.

doi:10.1088/1367-2630/15/5/053005

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Evidence for two-gap superconductivity in the non-centrosymmetric compound LaNiC₂

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Zhang, J. L.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Nicklas, M.
Michael Nicklas, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich, F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Yuan, H. Q.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Chen, J., Jiao, L., Zhang, J. L., Chen, Y., Yang, L., Nicklas, M., et al. (2013). Evidence for two-gap superconductivity in the non-centrosymmetric compound LaNiC₂. New Journal of Physics, 15: 053005, pp. 053005-1-053005-16. doi:10.1088/1367-2630/15/5/053005.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0015-1ED0-C

Abstract

We study the superconducting properties of the non-centrosymmetric compound LaNiC2 by measuring the London penetration depth Delta lambda(T), the specific heat C(T, B) and the electrical resistivity rho(T, B). Both Delta lambda(T) and the electronic specific heat C-e(T) exhibit behavior at low temperatures that can be described in terms of a phenomenological two-gap Bardeen-Cooper-Schrieffer (BCS) model. The residual Sommerfeld coefficient in the superconducting state, gamma(0)(B), shows a rapid increase at low fields and then an eventual saturation with increasing magnetic field. A pronounced upturn curvature is observed in the upper critical field B-c2(T) near T-c. All these experimental observations support the existence of two-gap superconductivity in LaNiC2.