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The electron paramagnetic resonance (EPR) g factors g_x, g_y and g_z of theorthorhombic Cu^{2+}(1) site in fresh PrBa_{2}Cu_{3}O_{6+x} powders aretheoretically investigated using the perturbation formulas of the g factors fora 3d^9 ion under orthorhombically elongated octahedra. The local orthorhombicdistortion around the Cu^{2+}(1) site due to the Jahn-Teller effect isdescribed by the orthorhombic field parameters from the superposition model.The [CuO6]^{10-} complex is found to experience an axial elongation of about0.04 {\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 ofthe g factors based on the above local structure are in reasonable agreementwith the experimental data.

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