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

S. Maeda; K. Matano; Guo Qing Zheng

doi:10.1103/PhysRevB.97.184510

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

S. Maeda, K. Matano, Guo Qing Zheng

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

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.

Original language	English
Journal	Physical Review B
Volume	97
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.97.184510
Publication status	Published - May 21 2018

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.97.184510

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

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.",

author = "S. Maeda and K. Matano and Zheng, {Guo Qing}",

note = "Funding Information: We thank G. F. Chen for collaboration using a single crystal in the early stage of this work. This work was supported by the JSPS Grants (No. JP15H05852, No. JP16H04016, and No. JP17K14340). Funding Information: We thank G. F. Chen for collaboration using a single crystal in the early stage of this work. This work was supported by the JSPS Grants (No. JP15H05852, No. JP16H04016, and No. JP17K14340). Publisher Copyright: {\textcopyright} 2018 American Physical Society.",

year = "2018",

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doi = "10.1103/PhysRevB.97.184510",

language = "English",

volume = "97",

journal = "Physical Review B",

issn = "2469-9950",

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T1 - Fully gapped spin-singlet superconductivity in noncentrosymmetric PbTaSe2

T2 - Pb 207 nuclear magnetic resonance study

AU - Maeda, S.

AU - Matano, K.

AU - Zheng, Guo Qing

N1 - Funding Information: We thank G. F. Chen for collaboration using a single crystal in the early stage of this work. This work was supported by the JSPS Grants (No. JP15H05852, No. JP16H04016, and No. JP17K14340). Funding Information: We thank G. F. Chen for collaboration using a single crystal in the early stage of this work. This work was supported by the JSPS Grants (No. JP15H05852, No. JP16H04016, and No. JP17K14340). Publisher Copyright: © 2018 American Physical Society.

PY - 2018/5/21

Y1 - 2018/5/21

N2 - 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.

AB - 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.

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

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