Abstract
The temperature dependences of the magnetic hyperfine interactions of three iron species occurring in YBa2(Cu0.9Fe0.1)O7- delta have been studied by 57Fe Mossbauer spectroscopy. The analysis was performed using the eigenvalues and eigenvectors of the Hamiltonian of the combined electric quadrupole interactions and the magnetic hyperfine interactions for determination of the line positions and intensities. This allows one to derive the electric field gradients with their signs and their directions versus the magnetic hyperfine fields. Evidence is given that the magnetic hyperfine splittings are not due to slow paramagnetic relaxation but are caused by magnetic order probably of a highly anisotropic antiferromagnetic type.
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