Studies of the EPR g factors and the local structures for the orthorhombic Era(3+) centers in garnets

IMR OpenIR

	Studies of the EPR g factors and the local structures for the orthorhombic Era(3+) centers in garnets
	S. Y. Wu; H. N. Dong
	2005
发表期刊	Optical Materials
ISSN	0925-3467
卷号	27 期号:8 页码:1373-1378
摘要	The perturbation formulas of the EPR g factors g,, g and g. for a 4f(11) 1 ion in orthorhombic symmetry are established. In these formulas, the contributions to the g factors arising from the second-order perturbation terms and the admixture of various states are taken into account. The above formulas are applied to the orthorhombic Er3+ centers in YAG, YGG and LuGG garnets. By analyzing their g factors, we find that the polar angles theta(j)(') of the impurity-ligand bonds related to the Z axis of the crystals in these Er3+ centers are smaller than the host angles theta(j) in pure crystals, whereas the azimuthal angles, related to the X axis in the impurity centers are larger than the corresponding phi(j) in the hosts. The g factors and their anisotropies Delta g [= g(z) - (g(x) + g(y))/2] and delta g (= g(x) - g(y)) for Er3+ in the garnets based on the above local structural parameters are in good agreement with the observed values. In addition, the angular distortions Delta theta (= theta(j)(') - theta(j)) or Delta phi (= phi(j)(') - phi(j)) obtained by analyzing the EPR data in this work are different from Delta theta(2), or Delta phi(2) (for only the second set of ligands, i.e., j = 2) based on the superposition model crystal-field analysis in the previous work. The validity of the results is discussed. (c) 2004 Elsevier B.V. All rights reserved.
部门归属	univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china. chongqing univ, coll elect engn, chongqing 400065, peoples r china.;wu, sy (reprint author), univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china;wushaoyi@netcase.com
关键词	Electron Paramagnetic Resonance (Epr) Defect Structure Crystal-field And Spin Hamiltonians Er3++ Garnets
URL	查看原文
WOS记录号	WOS:000229196800009
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35126
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. Studies of the EPR g factors and the local structures for the orthorhombic Era(3+) centers in garnets[J]. Optical Materials,2005,27(8):1373-1378.
APA	S. Y. Wu,&H. N. Dong.(2005).Studies of the EPR g factors and the local structures for the orthorhombic Era(3+) centers in garnets.Optical Materials,27(8),1373-1378.
MLA	S. Y. Wu,et al."Studies of the EPR g factors and the local structures for the orthorhombic Era(3+) centers in garnets".Optical Materials 27.8(2005):1373-1378.