Theoretical studies of the g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta superconductors

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	Theoretical studies of the g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta superconductors
	S. Y. Wu; H. N. Dong
	2004
发表期刊	Journal of Alloys and Compounds
ISSN	0925-8388
卷号	379 期号:1-2 页码:36-40
摘要	The EPR g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta high-T-c superconductors are theoretically studied by using the perturbation formulas of the g factors for a 4f(11) ion in tetragonal and orthorhombic symmetries. In these formulas, the contributions to the g factors from the second-order perturbation terms and the admixture of various states are taken into account. The relevant crystal-field parameters are determined from the local geometrical relationship of the magnetic Er3+ sites and the superposition model (SPM). The theoretical g factors for Er3+ of both symmetries are in agreement with the observed values, by adjusting the related SPM parameters. The lowest Kramers doublets are found to be, respectively, (Gamma(7) + Gamma(8)) and (Gamma(5) + Gamma(6)) for the tetragonal and orthorhombic ErBa2Cu3O7-delta superconductors. The above studies may be helpful to understand the change of the Er3+ anisotropy from Ising- to XY-like as the symmetry varies from orthorhombic to tetragonal. (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 inst posts & telecommun, 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@netease.com
关键词	Electron Paramagnetic Resonance (Epr) Crystal-fields And Spin Hamiltonians Er3++ High-t-c Superconductors Superposition-model Phase-stability Rare-earth Ion Yba2cu3oy Ca Re
URL	查看原文
WOS记录号	WOS:000224132600009
引用统计	被引频次：4[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/321006/35619
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. Theoretical studies of the g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta superconductors[J]. Journal of Alloys and Compounds,2004,379(1-2):36-40.
APA	S. Y. Wu,&H. N. Dong.(2004).Theoretical studies of the g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta superconductors.Journal of Alloys and Compounds,379(1-2),36-40.
MLA	S. Y. Wu,et al."Theoretical studies of the g factors for the tetragonal and orthorhombic Er3+ sites in ErBa2Cu3O7-delta superconductors".Journal of Alloys and Compounds 379.1-2(2004):36-40.