Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe2: Pb-207 nuclear magnetic resonance study

S. Maeda
K. Matano
Guo-qing Zheng

We report the Pb-207 nuclear magnetic resonance (NMR) measurements on polycrystalline sample of PbTaSe2 with noncentrosymmetric crystal structure and topological electronic band. The nuclear spin-lattice relaxation rate 1 / T-1) shows a suppressed coherence peak below the superconducting transition temperature T-c = 4.05 K and decreases as an exponential function of temperature. The penetration depth derived from the NMR spectrum is almost temperature independent below T = 0.7 T-c. The Knight shift K decreases below T-c. These results suggest spin-singlet superconductivity with a fully opened gap 2 Delta = 3.5 k(B)T(c) in PbTaSe2.

Physical Review B

AMER PHYSICAL SOC

97

18

184510-1

184510-5

10.1103/PhysRevB.97.184510

https://doi.org/10.1103/PhysRevB.97.184510
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