Ferromagnetism and ferroelectricity in Eu<Emphasis Type="Italic">X</Emphasis> (<Emphasis Type="Italic">X</Emphasis> = <Emphasis Type="Italic">O</Emphasis>, <Emphasis Type="Italic">S</Emphasis>): pressure effects |
| |
Authors: | Mostefa Djermouni Ali Zaoui Salima Kacimi Nawel Benayad Abdelkader Boukortt |
| |
Institution: | 1.Laboratoire de Physique Computationnelle des Matériaux, Université Djillali Liabés de Sidi Bel-Abbés,Sidi Bel-Abbés,Algeria;2.Département de Physique, Institut de Sciences de la nature et de vie & Sciences exactes (SNV-SE), Centre Universitaire Ahmed ZABANA, Relizane,Relizane,Algeria;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 Mostaganem,Mostaganem,Algeria |
| |
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: | |
本文献已被 SpringerLink 等数据库收录! |
|