Abstract
Mössbauer Spectroscopy studies with 119Sn substituted for Cu in GdBa 2(Cu 0.99Sn 0.01) 3O 7 ( T c = 90 K) reveal the occurrence of a transferred hyperfine interaction at temperatures below 60 K. The effective magnetic field is 8.3 KOe at 57 K and decreases gradually with decreasing temperature to 6 KOeat 16 K. The onset of the magnetic interaction at the non-paramagnetic 119Sn probe is explained in terms of local depletion of holes due to the Sn 4+ doping, consequently quenching the magnetic fluctuations around the impurity. These experimental findings provide strong evidence for spin-spin correlations originating from the Cu 2+ moments and present in the superconducting state.
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