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

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  • Fully gapped spin-singlet superconductivity in noncentrosymmetric<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>PbTaSe</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>:<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi>Pb</mml:mi><mml:mprescripts/><mml:none/><mml:mn>207</mml:mn></mml:mmultiscripts></mml:math>nuclear magnetic resonance study
  • Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe2:207Pb nuclear magnetic resonance study

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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.

Journal

  • Physical Review B

    Physical Review B 97 (18), 184510-, 2018-05-21

    American Physical Society (APS)

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