Superconductivity by alloying the topological insulator SnBi2Te4

Michael A. McGuire; Heda Zhang; Andrew F. May; Satoshi Okamoto; Robert G. Moore; Xiaoping Wang; Clément Girod; Sean M. Thomas; Filip Ronning; Jiaqiang Yan

doi:10.1103/PhysRevMaterials.7.034802

Superconductivity by alloying the topological insulator SnBi2Te4

Michael A. McGuire, Heda Zhang, Andrew F. May, Satoshi Okamoto, Robert G. Moore, Xiaoping Wang, Clément Girod, Sean M. Thomas, Filip Ronning, Jiaqiang Yan

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3 Scopus citations

Abstract

Alloying indium into the topological insulator SnBi2Te4 induces bulk superconductivity with critical temperatures Tc up to 1.85 K and upper critical fields up to about 14 kOe. This is confirmed by electrical resistivity, heat capacity, and magnetic susceptibility measurements. The heat capacity shows a discontinuity at Tc and temperature dependence below Tc consistent with weak coupling BCS theory, and suggests a superconducting gap near 0.25 meV. The superconductivity is type-II and the topological surface states have been verified by photoemission. A simple picture suggests analogies with the isostructural magnetic topological insulator MnBi2Te4, in which a natural heterostructure hosts complementary properties on different sublattices, and motivates new interest in this large family of compounds. The existence of both topological surface states and superconductivity in Sn1-xInxBi2Te4 identifies these materials as promising candidates for the study of topological superconductivity.

Original language	English
Article number	034802
Journal	Physical Review Materials
Volume	7
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevMaterials.7.034802
State	Published - Mar 2023

Funding

This material is based upon work supported by the U.S. Department of Energy, Office of Science, National Quantum Information Science Research Centers, Quantum Science Center. AFM acknowledges support from the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (heat capacity measurements). A portion of this research used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Funders	Funder number
National Quantum Information Science Research Centers
Quantum Science Center
U.S. Department of Energy
Office of Science
Basic Energy Sciences
Oak Ridge National Laboratory
Division of Materials Sciences and Engineering

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10.1103/PhysRevMaterials.7.034802

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title = "Superconductivity by alloying the topological insulator SnBi2Te4",

abstract = "Alloying indium into the topological insulator SnBi2Te4 induces bulk superconductivity with critical temperatures Tc up to 1.85 K and upper critical fields up to about 14 kOe. This is confirmed by electrical resistivity, heat capacity, and magnetic susceptibility measurements. The heat capacity shows a discontinuity at Tc and temperature dependence below Tc consistent with weak coupling BCS theory, and suggests a superconducting gap near 0.25 meV. The superconductivity is type-II and the topological surface states have been verified by photoemission. A simple picture suggests analogies with the isostructural magnetic topological insulator MnBi2Te4, in which a natural heterostructure hosts complementary properties on different sublattices, and motivates new interest in this large family of compounds. The existence of both topological surface states and superconductivity in Sn1-xInxBi2Te4 identifies these materials as promising candidates for the study of topological superconductivity.",

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AU - McGuire, Michael A.

AU - Zhang, Heda

AU - May, Andrew F.

AU - Okamoto, Satoshi

AU - Moore, Robert G.

AU - Wang, Xiaoping

AU - Girod, Clément

AU - Thomas, Sean M.

AU - Ronning, Filip

AU - Yan, Jiaqiang

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AB - Alloying indium into the topological insulator SnBi2Te4 induces bulk superconductivity with critical temperatures Tc up to 1.85 K and upper critical fields up to about 14 kOe. This is confirmed by electrical resistivity, heat capacity, and magnetic susceptibility measurements. The heat capacity shows a discontinuity at Tc and temperature dependence below Tc consistent with weak coupling BCS theory, and suggests a superconducting gap near 0.25 meV. The superconductivity is type-II and the topological surface states have been verified by photoemission. A simple picture suggests analogies with the isostructural magnetic topological insulator MnBi2Te4, in which a natural heterostructure hosts complementary properties on different sublattices, and motivates new interest in this large family of compounds. The existence of both topological surface states and superconductivity in Sn1-xInxBi2Te4 identifies these materials as promising candidates for the study of topological superconductivity.

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Superconductivity by alloying the topological insulator SnBi2Te4

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