Investigations of the electron paramagnetic resonance g factors for the two Er3+ centers in SrLaAlO4

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	Investigations of the electron paramagnetic resonance g factors for the two Er3+ centers in SrLaAlO4
	S. Y. Wu; H. N. Dong
	2005
发表期刊	Journal of Magnetism and Magnetic Materials
ISSN	0304-8853
卷号	292 页码:248-254
摘要	The electron paramagnetic resonance (EPR) g factors for the tetragonal and rhombic Er3+ centers in SrLaAlO4 (SLA) are theoretically investigated by using the perturbation formulas of the g factors for a 4f(11) ion in tetragonal and rhombic symmetries. In these formulas, the contributions to the g factors arising from the second-order perturbation terms and the admixture of various energy levels are included. The crystal-field parameters used in the calculations are determined from the superposition model and the structural data of the tetragonally and rhombically distorted [ErO9](15-) clusters. Based on the studies, the rhombic center may be ascribed to the impurity Er3+ undergoing an off-center displacement Delta X(approximate to 0.37 angstrom) along one of the [110] axes, due to the relaxation effect in the ab plane where one of its nine second-nearest-neighbor La3+ is substituted by an additional Er3+ at the high concentration. The calculated g factors for Er3+ on both Sr2+ and La3+ sites (particularly their average values) show reasonable agreement with the experimental data. This may be regarded as one theoretical indication of the compositional disorder of Sr2+ and La3+ in SLA, in addition to the line broadening of the experimental optical and EPR spectra. The contributions to the g factors from various effects are discussed. (c) 2004 Elsevier B.V. All rights reserved.
部门归属	univ elect sci & technol china, coll phys elect, dept appl phys, chengdu 610054, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. chongqing univ posts & telecommun, coll elect engn, chongqing 400065, peoples r china.;wu, sy (reprint author), univ elect sci & technol china, coll phys elect, dept appl phys, chengdu 610054, peoples r china;wushaoyi@netease.com
关键词	Electron Paramagnetic Resonance (Epr) Crystal-field And Spin-hamiltonians Er3++ Srlaalo4 Substitutional Disorder Optical-spectra Theoretical Investigations Brillouin-scattering Superposition-model Single-crystals Spin-resonance Liyf4 Crystal Parameters Cayalo4
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WOS记录号	WOS:000228838000032
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35128
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	S. Y. Wu,H. N. Dong. Investigations of the electron paramagnetic resonance g factors for the two Er3+ centers in SrLaAlO4[J]. Journal of Magnetism and Magnetic Materials,2005,292:248-254.
APA	S. Y. Wu,&H. N. Dong.(2005).Investigations of the electron paramagnetic resonance g factors for the two Er3+ centers in SrLaAlO4.Journal of Magnetism and Magnetic Materials,292,248-254.
MLA	S. Y. Wu,et al."Investigations of the electron paramagnetic resonance g factors for the two Er3+ centers in SrLaAlO4".Journal of Magnetism and Magnetic Materials 292(2005):248-254.