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New Verbeekite-type polymorphic phase and rich phase diagram in the PdSe2−xTex system

Wenhao Liu1, Mehrdad Rostami Osanloo1, Xiqu Wang3, Sheng Li1, Nikhil Dhale1, Hanlin Wu1, Maarten L. Van de Put2, Sabyasachi Tiwari2, William G. Vandenberghe2 et al.

Bing Lv1,2,*

  • 1Department of Physics, University of Texas at Dallas, Richardson, Texas 75080, USA
  • 2Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080, USA
  • 3Department of Chemistry, University of Houston, Houston, Texas 77004, USA

  • *blv@utdallas.edu
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Phys. Rev. B 104, 024507 – Published 22 July, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.024507

Abstract

We report a combined experimental and theoretical study of the PdSe2−xTex system. With increasing Te fraction, structural evolutions, first from an orthorhombic phase (space group Pbca) to a monoclinic phase (space group C2/c) and then to a trigonal phase (space group P−3m1), are observed accompanied with clearly distinct electrical transport behavior. The new monoclinic phase (C2/c) belongs to the very rare Verbeekite polymorphism and is discovered within a narrow range of Te composition (0.3≤x≤0.8). Electronic calculations and detailed transport analysis of the Verbeekite polymorphic PdSe1.3Te0.7 phase are presented. In the trigonal phase region, superconductivity with enhanced critical temperature is also observed within a narrow range of Te content (1.0≤x≤1.2). The rich phase diagram, new polymorphic structure, and abnormally enhanced superconductivity could further stimulate interest to explore new types of polymorphs and investigate their transport and electronic properties in the family of transition metal dichalcogenides, which are of significant interest.

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Phys. Rev. B 104, 024507– Published 22 July, 2021
  • Received 19 March 2021
  • Revised 29 June 2021
  • Accepted 6 July 2021
Article part of CHORUS
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