Abstract
The high-temperature superconductor with the nominal composition YBa2Cu3O7−σ has been doped with iron 93% enriched in57Fe. When 1.5 at % Fe substitutes for Cu, the transition temperature is reduced by about 30° K with full ac shielding (X′=−1/4π) achieved by ≈40 K. At room temperature the Mossbauer spectrum consists of three overlapping doublets. Below 10 K, hyperfine-field splitting is observed; relaxation still takes place at T=1.8 K.
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