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Author (up) Causa, M. T.; Fainstein, C.; Nieva, G.; S\'anchez, R.; Steren, L. B.; Tovar, M.; Zysler, R.; Vier, D. C.; Schultz, S.; Oseroff, S. B.; Fisk, Z.; Smith, J. L. openurl 
  Title Crystal-field interaction in the GdxEu1-xBa2Cu3O7-? superconductors Type Journal Article
  Year 1988 Publication Physical Review B Abbreviated Journal Phys. Rev. B  
  Volume 38 Issue Pages 257-261  
  Abstract We report here experimental data on the crystal-field interaction of gadolinium ions with their environment in GdxEu1-xBa2Cu3O7-?. The ESR spectrum and a Schottky anomaly in the specific heat of dilute samples (x?1) indicate the existence of a crystal-field splitting of the 8S7/2 ground state of Gd3+ ions of about 1.5 K. We discuss the parametrization of the measured splitting in terms of an effective Hamiltonian, and the microscopic origin of the interaction within the framework of a superposition model. Since the single-ion energies involved are of the same order of magnitude as the energies associated with the magnetic ordering of the Gd3+ moments in GdBa2Cu3O7-? (TN?2.24 K), we analyze the effects of the crystal-field interaction on the magnetic transition.  
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  Notes Approved no  
  Call Number BT @ gnieva @ Serial 433  
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