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Helimagnets by disorder: Its role on the high-temperature magnetic spiral in the YBaCuFeO5 perovskite

Arnau Romaguera1, Xiaodong Zhang1, Oscar Fabelo2, Francois Fauth3, Javier Blasco4, and José Luis García-Muñoz1,*

  • 1Institut de Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Catalunya, Spain
  • 2Institut Laue-Langevin, 38042 Grenoble, France
  • 3CELLS-ALBA Synchrotron, 08290 Cerdanyola del Vallès, Barcelona, Spain
  • 4Instituto de Nanociencia y Materiales de Aragón, Departamento de Física de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain

  • *garcia.munoz@icmab.es
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Phys. Rev. Research 4, 043188 – Published 14 December, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.043188

Abstract

Most of the spiral magnetoelectric multiferroics investigated in recent years are geometrically or exchange-frustrated magnets, where the presence of triangular or other frustrated spin networks produce low magnetic transition temperatures. This critically limits their potential uses. The exceptional stability of the spiral magnetic order (at TS) in the layered structure of the YBaCuFeO5 double perovskite involves a nonconventional mechanism: spiral order by disorder. The model has been theoretically developed by Scaramucci et al. [Phys. Rev. Res. 2, 013273 (2020)] after the discovery of a huge impact of cation disorder on TS [M. Morin et al., Nat. Commun. 7, 13758 (2016)]. In this work the influence of disorder (and only disorder) on the magnetic phase diagram is studied on a quantitative basis extending the range of previous studies. We thoroughly investigate the impact of frustration due to B-site disorder (nd) on the magnetic spirals in the reference composition YBaCuFeO5. The interplay between disorder, stability, and the detailed features of the incommensurate spiral magnetic orders were systematic, quantitative, and methodically investigated in samples of identical composition, spanning a wide range of nd values. Three different regimes are distinguished in the YBaCuFeO5 phase diagram versus disorder. A triple point is found in YBaCuFeO5 driven by Fe/Cu disorder that sets limits to TS and the cycloidal component of the helicoidal order. These layered materials appear as a very efficient realization of the avenue “spiral order by disorder” to supply functional helimagnets at normal working temperatures.

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Phys. Rev. Research 4, 043188– Published 14 December, 2022
  • Received 2 April 2022
  • Revised 28 August 2022
  • Accepted 31 October 2022
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