Nodeless superconductivity in noncentrosymmetric PbTaSe$_2$ single crystals

G. M. Pang; M. Smidman; L. X. Zhao; Y. F. Wang; Z. F. Weng; L. Q. Che; Y. Chen; X. Lu; G. F. Chen; H. Q. Yuan

doi:10.1103/PhysRevB.93.060506

Nodeless superconductivity in noncentrosymmetric PbTaSe$_2$ single crystals

Superconductivity 2016-02-23 v1

Authors: G. M. Pang , M. Smidman , L. X. Zhao , Y. F. Wang , Z. F. Weng , L. Q. Che , Y. Chen , X. Lu , G. F. Chen , H. Q. Yuan

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Abstract

We report an investigation of the superconducting order parameter of the noncentrosymmetric compound PbTaSe $_2$ , which is believed to have a topologically nontrivial band structure. Precise measurements of the London penetration depth $\Delta\lambda(T)$ obtained using a tunnel diode oscillator (TDO) based method show an exponential temperature dependence at $T\ll T_c$ , suggesting a nodeless superconducting gap structure. A single band s-wave model well describes the corresponding normalized superfluid density, with a gap magnitude of $\Delta(0)=1.85T_c$ . This is very close to the value of $1.76T_c$ for weak-coupling BCS superconductors, indicating conventional fully-gapped superconductivity in PbTaSe $_2$ .

Keywords

noncentrosymmetric superconductor PbTaSe2 nodeless superconductivity London penetration depth s-wave gap BCS theory

Cite

@article{arxiv.1512.02459,
  title  = {Nodeless superconductivity in noncentrosymmetric PbTaSe$_2$ single crystals},
  author = {G. M. Pang and M. Smidman and L. X. Zhao and Y. F. Wang and Z. F. Weng and L. Q. Che and Y. Chen and X. Lu and G. F. Chen and H. Q. Yuan},
  journal= {arXiv preprint arXiv:1512.02459},
  year   = {2016}
}

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5 pages, 4 figures

Nodeless superconductivity in noncentrosymmetric PbTaSe$_2$ single crystals

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