Theoretical studies of 63Cu Knight shifts of the normal state of YBa2Cu3O7

Details Theoretical studies of 63Cu Knight shifts of the normal state of YBa2Cu3O7 Theoretical studies of 63Cu Knight shifts of the normal state of YBa2Cu3O7

2012-02-21

arxiv.org/abs/1202.4598v1

Condens. Matter Phys., 2011, vol. 14, No. 4, p. 43701:1-5

Physics

Condensed Matter

Superconductivity

5 pages

Scientific paper

10.5488/CMP.14.43701

The 63Cu Knight shifts and g factors for the normal state of YBa2Cu3O7 in tetragonal phase are theoretically studied in a uniform way from the high (fourth-) order perturbation formulas of these parameters for a 3d9 ion under tetragonally elongated octahedra. The calculations are quantitatively correlated with the local structure of the Cu2+(2) site in YBa2Cu3O7. The theoretical results show good agreement with the observed values, and the improvements are achieved by adopting fewer adjustable parameters as compared to the previous works. It is found that the significant anisotropy of the Knight shifts is mainly attributed to the anisotropy of the g factors due to the orbital interactions.

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