Coupled short-range ferroelectric and magnetic order in PbFe1/2Nb1/2O3

被引：12

作者：

Stock, C. ^{[1
]}

Dunsiger, S. R. ^{[2
]}

Mole, R. A. ^{[3
,4
]}

Li, X. ^{[5
]}

Luo, H. ^{[5
]}

机构：

[1] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[2] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

[3] Forschungsneutronenquelle Heinz Maier Leibnitz, D-85747 Garching, Germany

[4] Bragg Inst, ANSTO, Kirrawee, NSW 2232, Australia

[5] Chinese Acad Sci, Shanghai Inst Ceram, Shanghai 201800, Peoples R China

来源：

PHYSICAL REVIEW B | 2013年 / 88卷 / 09期

关键词：

INELASTIC NEUTRON-SCATTERING; RELAXOR FERROELECTRICS; PHASE-TRANSITIONS; LATTICE-DYNAMICS; PEROVSKITE; TEMPERATURE;

D O I：

10.1103/PhysRevB.88.094105

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A neutron scattering investigation of the magnetoelectric coupling in PbFe1/2Nb1/2O3 has been undertaken. Ferroelectric order occurs below 400 K, as evidenced by the softening with temperature and subsequent recovery of the zone center transverse optic phonon mode energy ((h) over bar Omega(0)). Over the same temperature range, magnetic correlations become resolution limited on a terahertz energy scale. In contrast to the behavior of nonmagnetic disordered ferroelectrics [namely Pb(Mg, Zn)(1/3)Nb2/3O3], we report the observation of a strong deviation from linearity in the temperature dependence of ((h) over bar Omega(0))(2). This deviation is compensated by a corresponding change in the energy scale of the magnetic excitations, as probed through the first moment of the inelastic response. The coupling between the short-range ferroelectric and antiferromagnetic correlations is consistent with calculations showing that the ferroelectricity is driven by the displacement of the body-centered iron site, illustrating the multiferroic nature of magnetic-lead-based relaxors in the dynamical regime.

引用

页数：7

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