1210.2185 (M. Q. Kuang et al.)

Investigations of the g factors and local structure for orthorhombic
Cu^{2+}(1) site in fresh PrBa_{2}Cu_{3}O_{6+x} powders    [PDF]

M. Q. Kuang, S. Y. Wu, B. T. Song, X. F. Hu

The electron paramagnetic resonance (EPR) g factors g_x, g_y and g_z of the orthorhombic Cu^{2+}(1) site in fresh PrBa_{2}Cu_{3}O_{6+x} powders are theoretically investigated using the perturbation formulas of the g factors for a 3d^9 ion under orthorhombically elongated octahedra. The local orthorhombic distortion around the Cu^{2+}(1) site due to the Jahn-Teller effect is described by the orthorhombic field parameters from the superposition model. The [CuO6]^{10-} complex is found to experience an axial elongation of about 0.04 {\AA} along c axis and the relative bond length variation of about 0.09 {\AA} along a and b axes of the Jahn-Teller nature. The theoretical results of the g factors based on the above local structure are in reasonable agreement with the experimental data.

View original: http://arxiv.org/abs/1210.2185