An X- and Q-band Gd3+ EPR study of a single crystal of EuAlO3: EPR linewidth variation with temperature and low-symmetry effects

被引：8

作者：

Andronenko, Sergey I. ^{[2
]}

Andronenko, Roza R. ^{[3
]}

Misra, Sushil K. ^{[1
]}

机构：

[1] Concordia Univ, Dept Phys, Montreal, PQ H3G 1M8, Canada

[2] Kazan Fed Univ, Dept Phys, Kazan 420008, Russia

[3] Russian Acad Sci, Inst Silicate Chem, St Petersburg 199034, Russia

来源：

PHYSICA B-CONDENSED MATTER | 2012年 / 407卷 / 08期

基金：

加拿大自然科学与工程研究理事会;

关键词：

Gd3+ ion; EPR; Spin-Hamiltonian parameters; EuAlO3; Van-Vleck paramagnet; X-band; Q-band; Lifetime broadening; Low symmetry; PARAMAGNETIC-RESONANCE; MONOCLINIC SYMMETRY; SPIN; PARAMETERS; SPECTRA;

D O I：

10.1016/j.physb.2012.01.094

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Detailed electron paramagnetic resonance (EPR) studies on a single crystal of Gd3+-doped Van-Vleck compound EuAlO3, potentially a phosphorescent/luminescent/laser material, with the Gd3+ ion substituting for the Eu3+ ion, were carried out at X-band (9.2 GHz) over the 77-400 K temperature range. They provide new physical results on magnetic properties of the Eu3+ ion in a low symmetry environment. The asymmetry exhibited by the variation of the Gd3+ EPR line positions for the orientations of the external magnetic field about the Z and X magnetic axes in the ZX plane was ascribed to the existence of low, monoclinic, site symmetry, as revealed by the significant values of the spin-Hamiltonian (SH) parameters b(4)(1) and b(4)(3), estimated by fitting all the observed EPR line positions at room temperature for the orientation of the magnetic field in the magnetic ZX plane using a least-square fitting procedure. The temperature dependence of the Gd3+ EPR linewidth is interpreted to be due to the "life-time" broadening, caused by dynamical exchange and dipolar interactions between the impurity Gd3+ ions and the host Eu3+ ions. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：1203 / 1208

页数：6

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