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An investigation of the spin-Hamiltonian parameters for Gd3+-doped YBa2Cu3O6+y (y = 0.06) superconductor

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The spin-Hamiltonian parameters (g factors g and g and zero-field splittings &${b}_{2}^{0}$;, &${b}_{4}^{0}$;, &${b}_{4}^{4}$;, &${b}_{6}^{0}$; and &${b}_{6}^{4}$;) for Gd3+ ions at the tetragonal Y3+ site of YBa2Cu3O6+y (y = 0.06) superconductor are calculated together from a diagonalization (of the energy matrix) method based on the one-electron crystal field mechanism. In the method, a 56 × 56 energy matrix concerning the ground multiplet 8S7/2 and the excited multiplets 8L7/2 (where L = P, D, F, G, H, I) for 4f7 ions at a tetragonal crystal field and under an external magnetic field is constructed and used. The crystal field parameters &${B}_{k}^{q}$; in the energy matrix are obtained from the superposition model. The calculated results are in reasonable agreement with the experimental values. The defect structure (characterized by the angular distortion Δ) of the Gd3+ impurity centers in YBa2Cu3O6+y is also acquired from the calculation. The results are discussed.

Document Type: Research Article


Publication date: June 1, 2012

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