Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe2: Pb207 nuclear magnetic resonance study
S. Maeda, K. Matano, Guo-qing Zheng
DOI 10.1103/PhysRevB.97.184510 · Physical Review B
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Abstract
We report the Pb207 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/T1 shows a suppressed coherence peak below the superconducting transition temperature Tc=4.05K and decreases as an exponential function of temperature. The penetration depth derived from the NMR spectrum is almost temperature independent below T=0.7 Tc. The Knight shift K decreases below Tc. These results suggest spin-singlet superconductivity with a fully opened gap 2Δ=3.5kBTc in PbTaSe2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| PbTaSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.05 | Pressure not reported | onset |
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