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Title: Superconducting dome and crossover to an insulating state in [Tl{sub 4}]Tl{sub 1−x}Sn{sub x}Te{sub 3}

The structural, superconducting, and electronic phase diagram of [Tl{sub 4}]Tl{sub 1−x}Sn{sub x}Te{sub 3} is reported. Magnetization and specific heat measurements show bulk superconductivity exists for 0 ≤ x ≤ 0.4. Resistivity measurements indicate a crossover from a metallic state at x = 0 to a doped insulator at x = 1. Universally, there is a large non-Debye specific heat contribution, characterized by an Einstein temperature of θ{sub E} ≈ 35 K. Density functional theory calculations predict x = 0 to be a topological metal, while x = 1 is a topological crystalline insulator. The disappearance of superconductivity correlates with the transition between these distinct topological states.
Authors:
 [1] ;  [2] ;  [3] ;  [1] ;  [2] ;  [2]
  1. Department of Chemistry, The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
  2. (United States)
  3. Department of Materials Science and Engineering, The Johns Hopkins University, Baltimore, Maryland 21218 (United States)
Publication Date:
OSTI Identifier:
22415271
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CONCENTRATION RATIO; DENSITY FUNCTIONAL METHOD; DOPED MATERIALS; ELECTRONIC STRUCTURE; MAGNETIZATION; PHASE DIAGRAMS; PHASE TRANSFORMATIONS; SPECIFIC HEAT; SUPERCONDUCTIVITY; THALLIUM COMPOUNDS; TIN TELLURIDES; TOPOLOGY