Investigations of the <i>g</i> factors and local structure for orthorhombic Cu<sup>2+</sup>(1) site in fresh PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> powders
oleh: B.T. Song, S.Y. Wu, M.Q.Kuang, X.F. Hu
| Format: | Article |
|---|---|
| Diterbitkan: | Institute for Condensed Matter Physics 2012-10-01 |
Deskripsi
The electron paramagnetic resonance (EPR) <i>g</i> factors <i>g<sub>x</sub></i>, <i>g<sub>y</sub></i> and <i>g<sub>z</sub></i> of the orthorhombic Cu<sup>2+</sup>(1) site in fresh PrBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub> powders are theoretically investigated using the perturbation formulas of the <i>g</i> factors for a <i>3d<sup>9</sup></i> ion under orthorhombically elongated octahedra. The local orthorhombic distortion around the Cu<sup>2+</sup>(1) site due to the Jahn-Teller effect is described by the orthorhombic field parameters from the superposition model. The [CuO<sub>6</sub>]<sup>10-</sup> complex is found to experience an axial elongation of about 0.04 Å along <i>c</i> axis and the relative bond length variation of about 0.09 Å along <i>a</i> and <i>b</i> axes of the Jahn-Teller nature. The theoretical results of the <i>g</i> factors based on the above local structure are in reasonable agreement with the experimental data.