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Nodeless superconductivity in noncentrosymmetric PbTaSe$_2$ single crystals

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arxiv 1512.02459 v1 pith:ARTDITPS submitted 2015-12-08 cond-mat.supr-con

G. M. Pang , M. Smidman , L. X. Zhao , Y. F. Wang , Z. F. Weng , L. Q. Che , Y. Chen , X. Lu
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G. F. Chen H. Q. Yuan
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classification cond-mat.supr-con
keywords pbtasebanddeltanodelessnoncentrosymmetricsinglestructuresuperconducting
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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$_2$.

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