Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

Satoki Maeda; Ryohei Hirose; Kazuaki Matano; Mario Novak; Yoichi Ando; Guo Qing Zheng

doi:10.1103/PhysRevB.96.104502

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

Satoki Maeda, Ryohei Hirose, Kazuaki Matano, Mario Novak, Yoichi Ando, Guo Qing Zheng

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

12 Citations (Scopus)

Abstract

The In-doped topological crystalline insulator Sn1-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn1-xInxTe, we perform Te125-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0≤x≤0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (Tc) in polycrystalline Sn0.96In0.04Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (Ks) at an external magnetic field of μ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36±0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn0.96In0.04Te is a spin-singlet superconductor.

Original language	English
Article number	104502
Journal	Physical Review B
Volume	96
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.96.104502
Publication status	Published - Sept 5 2017

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te",

abstract = "The In-doped topological crystalline insulator Sn1-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn1-xInxTe, we perform Te125-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0≤x≤0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (Tc) in polycrystalline Sn0.96In0.04Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (Ks) at an external magnetic field of μ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36±0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn0.96In0.04Te is a spin-singlet superconductor.",

author = "Satoki Maeda and Ryohei Hirose and Kazuaki Matano and Mario Novak and Yoichi Ando and Zheng, {Guo Qing}",

note = "Funding Information: We thank Z. Wang for the Hall coefficient measurements and S. Katsube, K. Segawa, and S. Kawasaki for help with some of the measurements and acknowledge partial support by MEXT Grant No. 15H05852 (Topological Materials Science) and JSPS Grants No. 16H0401618 and No. 17K14340, as well as by NSFC (Grant No. 11634015) and DFG (CRC1238 “Control and Dynamics of Quantum Materials”; Project A04). Publisher Copyright: {\textcopyright} 2017 American Physical Society.",

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AU - Maeda, Satoki

AU - Hirose, Ryohei

AU - Matano, Kazuaki

AU - Novak, Mario

AU - Ando, Yoichi

AU - Zheng, Guo Qing

N1 - Funding Information: We thank Z. Wang for the Hall coefficient measurements and S. Katsube, K. Segawa, and S. Kawasaki for help with some of the measurements and acknowledge partial support by MEXT Grant No. 15H05852 (Topological Materials Science) and JSPS Grants No. 16H0401618 and No. 17K14340, as well as by NSFC (Grant No. 11634015) and DFG (CRC1238 “Control and Dynamics of Quantum Materials”; Project A04). Publisher Copyright: © 2017 American Physical Society.

PY - 2017/9/5

Y1 - 2017/9/5

N2 - The In-doped topological crystalline insulator Sn1-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn1-xInxTe, we perform Te125-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0≤x≤0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (Tc) in polycrystalline Sn0.96In0.04Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (Ks) at an external magnetic field of μ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36±0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn0.96In0.04Te is a spin-singlet superconductor.

AB - The In-doped topological crystalline insulator Sn1-xInxTe is a candidate for a topological superconductor, where a pseudo-spin-triplet state has been proposed. To clarify the spin symmetry of Sn1-xInxTe, we perform Te125-nuclear magnetic resonance (NMR) measurements in polycrystalline samples with 0≤x≤0.15. The penetration depth calculated from the NMR line width is T independent below half the superconducting transition temperature (Tc) in polycrystalline Sn0.96In0.04Te, which indicates a fully opened superconducting gap. In this sample, the spin susceptibility measured by the spin Knight shift (Ks) at an external magnetic field of μ0H0=0.0872 T decreases below Tc, and Ks(T=0)/Ks(T=Tc) reaches 0.36±0.10, which is far below the limiting value 2/3 expected for a spin-triplet state for a cubic crystal structure. Our result indicates that polycrystalline Sn0.96In0.04Te is a spin-singlet superconductor.

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Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te

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