Abstract
The RBa 2Cu 3O 7−y (R = Nd, Sm, Eu, Dy, Ho and Er) compounds have been prepared in the orthorhombic superconducting (SC) form by slow-cooling the samples to room temperature in oxygen atmosphere and in the tetragonal non-superconducting (non-SC) form by fast quenching to liquid nitrogen temperatures. Magnetic susceptibility measurements reveal a slight increase in the susceptibility of the non-superconducting samples over that of the superconducting samples above 100K. This may be due to a small magnetic moment on copper in non-SC samples. Crystal field effects are evident in the susceptibility of some of the non-SC compounds.
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