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 journalArticle

3 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 languageEnglish
Article number104502
JournalPhysical Review B
Volume96
Issue number10
DOIs
Publication statusPublished - Sep 5 2017

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Superconductivity
Superconducting materials
superconductivity
Nuclear magnetic resonance
insulators
Magnetic resonance measurement
Crystalline materials
nuclear magnetic resonance
Linewidth
Superconducting transition temperature
Crystal structure
Magnetic fields
atomic energy levels
resonance lines
penetration
transition temperature
magnetic permeability
crystal structure
symmetry
magnetic fields

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Spin-singlet superconductivity in the doped topological crystalline insulator Sn0.96In0.04Te. / Maeda, Satoki; Hirose, Ryohei; Matano, Kazuaki; Novak, Mario; Ando, Yoichi; Zheng, Guo-Qing.

In: Physical Review B, Vol. 96, No. 10, 104502, 05.09.2017.

Research output: Contribution to journalArticle

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AU - Ando, Yoichi

AU - Zheng, Guo-Qing

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