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Room temperature polar structure and multiferroicity in BaFe2Se3

W. Zheng, V. Balédent, M. B. Lepetit, P. Retailleau, E. V. Elslande, C. R. Pasquier, P. Auban-Senzier, A. Forget, D. Colson, and P. Foury-Leylekian
Phys. Rev. B 101, 020101(R) – Published 6 January 2020
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Abstract

The understanding of the superconducting phase under pressure in the famous iron-based spin ladder BaFe2Se3 commands a perfect understanding of the structural properties. We present an accurate single crystal x-ray analysis which demonstrates that the structure admitted until now at room temperature is totally ruled out. We show that the system has a polar structure already at 300 K and is thus ferroelectric. Its structure is modified below the Néel transition and the polarization is intensified. These features unambiguously prove the multiferroic character of BaFe2Se3 as proposed theoretically. This system evidences a competition between multiferroicity and superconductivity.

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  • Received 10 May 2019
  • Revised 25 October 2019

DOI:https://doi.org/10.1103/PhysRevB.101.020101

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

W. Zheng1, V. Balédent1, M. B. Lepetit2,3, P. Retailleau4, E. V. Elslande4, C. R. Pasquier1, P. Auban-Senzier1, A. Forget5, D. Colson5, and P. Foury-Leylekian1,*

  • 1Laboratoire de Physique des Solides, CNRS, Univ. Paris-Sud, Université Paris-Saclay, 91405 Orsay Cedex, France
  • 2Institut Néel, 38042 Grenoble, France
  • 3Institut Laue Langevin, 38000 Grenoble, France
  • 4Institut de Chimie des Substances Naturelles, CNRS UPR 2301, Université Paris-Sud, Université Paris-Saclay, 1 avenue de la Terrasse, 91198 Gif-sur-Yvette, France
  • 5SPEC, CEA, CNRS-UMR3680, Université Paris-Saclay, Gif-sur-Yvette Cedex 91191, France

  • *Corresponding author: pascale.foury@u-psud.fr

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Issue

Vol. 101, Iss. 2 — 1 January 2020

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