Formation of single-phase disordered CsxFe2ySe2 at high pressure

V. Svitlyk, E. Pomjakushina, A. Krzton-Maziopa, K. Conder, and M. Mezouar
Phys. Rev. B 97, 214512 – Published 15 June 2018
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Abstract

A single-phase high-pressure (HP) modification of CsxFe2ySe2 was synthesized at 11.8 GPa at ambient temperature. Structurally this polymorph is similar to the minor low-pressure (LP) superconducting phase; namely, they both crystallize in a ThCr2Si2-type structure without ordering of the Fe vacancies within the Fe-deficient FeSe4 layers. The HP CsxFe2ySe2 polymorph is found to be less crystalline and nearly twice as soft compared to the parent major and minor phases of CsxFe2ySe2. It can be quenched to low pressures and is stable at least on the scale of weeks. At ambient pressure the HP polymorph of CsxFe2ySe2 is expected to exhibit different superconducting properties compared to its LP minor phase (Tc=27K).

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  • Received 6 December 2017
  • Revised 10 April 2018

DOI:https://doi.org/10.1103/PhysRevB.97.214512

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

V. Svitlyk1,*, E. Pomjakushina2, A. Krzton-Maziopa3, K. Conder2, and M. Mezouar1

  • 1ID27 High Pressure Beamline, European Synchrotron Radiation Facility, 38000 Grenoble, France
  • 2Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen, Switzerland
  • 3Warsaw University of Technology, Faculty of Chemistry, 00-664 Warsaw, Poland

  • *svitlyk@esrf.fr

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Issue

Vol. 97, Iss. 21 — 1 June 2018

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