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Electron Paramagnetic Resonance of Tb3+ Ions in YBa2Cu3O6
Authors:M R Gafurov  V A Ivanshin  I N Kurkin  M P Rodionova  H Keller  M Gutmann and U Staub
Affiliation:(1) MRS Laboratory, Kazan State University, 420008 Kazan, Russia;(2) Physik-Institut der Universität Zürich, CH-8057 Zürich, Switzerland;(3) Laboratory for Neutron Scattering, ETH Zürich; and Paul Scherrer Institute, CH-5232 Villigen, Switzerland
Abstract:The first observation of electron paramagnetic resonance (EPR) of Tb3+ doped into YBa2Cu3O6 is reported. EPR is used to determine the local symmetry of the rare-earth ion and to study the effect of suppression of high-T c superconductivity by doping. The distance between the lowest singlets of Tb3+ ion Delta cong 7.1 GHz equiv 0.24 cm–1 and g-factor g par sime 17.9 have been estimated from measurements. Both these parameters are in a good agreement with the corresponding calculated values. No evidence of Tb4+ ions was found.
Keywords:EPR  YBCO  rare-earth ions  impurities
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