| Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature; Investigations of the g factors for the orthorhombic Co2+ center in YBa2Cu2.7Co0.3O7-x at room temperature | |
| S. Y. Wu; G. D. Lu; H. M. Zhang; Z. H. Zhang | |
| 2007 ; 2007 | |
| Source Publication | Physica C-Superconductivity and Its Applications
 ; Physica C-Superconductivity and Its Applications
|
| ISSN | 0921-4534 ; 0921-4534 |
| Volume | 466Issue:1-2Pages:163-167 |
| Abstract | 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.; 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. |
| description.department | 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.;wu, sy (reprint author), univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china;wushaoyi@netease.com ; 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.;wu, sy (reprint author), univ elect sci & technol china, dept appl phys, chengdu 610054, peoples r china;wushaoyi@netease.com |
| Keyword | Electron Paramagnetic Resonance Electron Paramagnetic Resonance Crystal Fields And Spin Hamiltonians Crystal Fields And Spin Hamiltonians Co2++ Co2++ Yba2cu2.7co0.3o7-x Yba2cu2.7co0.3o7-x Atomic Screening Constants Atomic Screening Constants D-orbital Theory D-orbital Theory Paramagnetic-resonance Paramagnetic-resonance Scf Functions Scf Functions Spin Gap Spin Gap Field Field Ions Ions 0-less-than-or-equal-to-x-less-than-or-equal-to-0.30 0-less-than-or-equal-to-x-less-than-or-equal-to-0.30 Yba2cu3o7-delta Yba2cu3o7-delta La2-xsrxcuo4 La2-xsrxcuo4 |
| URL | 查看原文 ; 查看原文 |
| WOS ID | WOS:000250695900026 ; WOS:000250695900026 |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/33916 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation 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, 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, Physica C-Superconductivity and Its Applications,2007, 2007,466, 466(1-2):163-167, 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. |
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