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Ferromagnetism and ferroelectricity in EuX (X = O, S): pressure effects

  • Mostefa Djermouni
  • Ali Zaoui
  • Salima Kacimi
  • Nawel Benayad
  • Abdelkader Boukortt
Regular Article

Abstract

Ferromagnetism and ferroelectricity in Eu monochalcogenides have been investigated by ab initio density functional theory in the DFT+U approach. Exchange interaction parameters and Curie temperatures under pressure are studied and discussed using Heisenberg Hamiltonian with first and second-nearest-neighbor interactions. The calculations showed that the hydrostatic pressure perfectly improves the Curie temperature (EuO: T C = 175 K; EuS: T C = 33.8 K) and in the other hand it cannot induce the spontaneous polarization (P s ). The effect of uniaxial and biaxial pressure is also studied. Although the uniaxial strains slightly increases the Curie temperature, it ensures the ferrolectricity in these systems by producing a spontaneous polarization of the order of P s (EuO) = 57.50 μC/cm2 and P s (EuS) = 42.86 μC/cm2 with pressures of 5% and 4%, respectively. The search for new model systems is a necessity to better understand the physics related to multiferroïc materials and to consider possible applications.

Keywords

Solid State and Materials 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Mostefa Djermouni
    • 1
    • 2
  • Ali Zaoui
    • 1
  • Salima Kacimi
    • 1
  • Nawel Benayad
    • 1
  • Abdelkader Boukortt
    • 3
  1. 1.Laboratoire de Physique Computationnelle des Matériaux, Université Djillali Liabés de Sidi Bel-AbbésSidi Bel-AbbésAlgeria
  2. 2.Département de Physique, Institut de Sciences de la nature et de vie & Sciences exactes (SNV-SE), Centre Universitaire Ahmed ZABANA, RelizaneRelizaneAlgeria
  3. 3.Laboratoire d’Elaboration et Caractérisation Physico Mécanique et Métallurgique des Matériaux (ECP3M), Département de Génie Electrique, Faculté des Sciences et de la Technologie, Université Abdel Hamid Ibn Badis de MostaganemMostaganemAlgeria

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