Investigations of Knight shifts and g factors for Y123 and Y124 superconductors

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• 作者：Min-Quan Kuang ; Shao-Yi Wu ; Xian-Fen Hu ; Guo-Liang Li ; Zhi-Hong Zhang
• 关键词：Knight shifts ; g Factors ; Cu ; YBa2Cu3O7 ; YBa2Cu3O7&minus ; ¦Ò ; YBa2Cu4O8
• 刊名：Physica C
• 出版年：2013
• 出版时间：15 September, 2013
• 年：2013
• 卷：492
• 期：Complete
• 页码：55-58
• 全文大小：317 K

文摘

By adopting the uniform high order perturbation formulas of Knight shifts and g factors for 3d⁹ ions in orthorhombically and tetragonally elongated octahedra, the experimental results of these parameters for Cu(1) sites in YBa₂Cu₃O₇, YBa₂Cu₃O_7?¦Ò and YBa₂Cu₄O₈ and Cu(2) site in YBa₂Cu₃O_7?¦Ò are systematically investigated. The calculated Knight shifts (and g factors for Cu(2) site) agree well with the observed values. The anisotropies of the g factors and Knight shifts are attributed to the local orthorhombic and tetragonal elongations of the Cu²⁺ sites. The present studies would be helpful to attain a more complete spectroscopic understanding for g factors and Knight shifts.