Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature
文献类型：期刊论文
| 作者 | S. Y. Wu ; G. D. Lu ; H. M. Zhang ; Z. H. Zhang |
| 刊名 | Physica C-Superconductivity and Its Applications
 |
| 出版日期 | 2007 |
| 卷号 | 466期号:1-2页码:163-167 |
| 关键词 | electron paramagnetic resonance crystal fields and spin hamiltonians Co2+ YBa2Cu2.7Co0.3O7-x atomic screening constants d-orbital theory paramagnetic-resonance scf functions spin gap field ions 0-less-than-or-equal-to-x-less-than-or-equal-to-0.30 yba2cu3o7-delta la2-xsrxcuo4 |
| ISSN号 | 0921-4534 |
| 中文摘要 | The anisotropic g factors g(x), g(y) and g(z) for the orthorhombic Co2+ center on the Cu(l) site in YBa2Cu2.7CO0.3O7-x at room temperature are theoretically investigated from the perturbation formulae of the g factors for a 3d(7) ion having low spin (S = 1/2) under octahedra with orthorhombic distortion. In these formulae, the contributions to the g factors from the orthorhombic crystal-fields as well as the ligand orbitals and spin-orbit coupling are taken into account based on the cluster approach. This center may be attributed to Co2+ located in a moderately compressed oxygen octahedron with additional orthorhombic distortion. The significant decline (characterized by the reduction factor y approximate to 0.13) of the energy separations due to the Jahn-Teller effect is suggested, by analyzing the experimental g factors. The calculated g factors based on the above contributions show good agreement with the observed values. In addition, the pronounced decrease in the intensity and the remarkable nonlinear increase in the g, of Co2+ EPR spectra as the temperature is lowered from room temperature to 150 K are also mentioned, in view of the opening of the spin gap due to antiferromagnetic interactions. (c) 2007 Elsevier B.V. All rights reserved. |
| 原文出处 | |
| 公开日期 | 2012-04-13 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/33916]  |
| 专题 | 金属研究所_中国科学院金属研究所 |
| 推荐引用方式 GB/T 7714 | S. Y. Wu,G. D. Lu,H. M. Zhang,et al. Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature[J]. Physica C-Superconductivity and Its Applications,2007,466(1-2):163-167. |
| APA | S. Y. Wu,G. D. Lu,H. M. Zhang,&Z. H. Zhang.(2007).Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature.Physica C-Superconductivity and Its Applications,466(1-2),163-167. |
| MLA | S. Y. Wu,et al."Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature".Physica C-Superconductivity and Its Applications 466.1-2(2007):163-167. |
入库方式： OAI收割
来源：金属研究所
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