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Investigations on the spin Hamiltonian parameters for Gd3+in YBa2Cu3O6+ x

Authors
Journal
Physica C Superconductivity
0921-4534
Publisher
Elsevier
Publication Date
Volume
424
Identifiers
DOI: 10.1016/j.physc.2005.04.017
Keywords
  • Electron Paramagnetic Resonance (Epr)
  • Hightcsuperconductors
  • Crystal Fields And Spin Hamiltonians
  • Gd3+
  • Yba2Cu3O6+ X

Abstract

Abstract The spin Hamiltonian parameters [zero-field splittings (ZFSs) b 2 0 , b 2 2 , b 4 0 , b 4 4 , b 6 0 , b 6 4 and the g factors] for the orthorhombic Gd 3+ center in YBa 2Cu 3O 6+ x are theoretically investigated from the superposition model formulas for the ZFSs and the approximation formula of the g factors including admixture of the ground 8S 7/2 and the excited 6L 7/2 (L = P, D, F, G) states via the spin–orbit coupling interactions, respectively. The large anisotropy of the g factors in the ( a, b) plane, originated from the anisotropy of spin susceptibility, is illustrated by the effective spin–orbit coupling coefficients ζ′ in the a and b principle axis directions. The calculated ZFSs and the g factors show reasonable agreement with the observed values.

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