Abstract
Heat capacity, resistivity, and magnetic susceptability data have been obtained for the compounds REBa 2Cu 3O 7- x , where RE = Dy, Ho or Er. Neutron diffraction data on the Ho compound show a structure identical to that of YBa 2Cu 3O 7- x . Magnetic transitions are observed at T m=0.95, 0.17 and 0.59 K for Dy, Ho and Er compounds, respectively. It is argued that these are due predominantly to dipolar interactions. Resistivity data show that the magnetic state is coexistent with superconductivity in all cases. From the heat capacity data, the degeneracies of the crystal field ground states are determined, and estimates are given for the magnetic moment in the ground state and the energy separation of the first excited crystal field state.
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