Abstract
Resistivity, D.C. susceptibility and Mo¨ssbauer spectra (MS) of YBa 2, 985Fe 0, 015O 7−δ have been obtained. The spectra in zero field show the presence of three inequivalent sites. Spectra at 4.2, 11, 25, 47 and 155 K in field of 5.5 Tesla reveal that in superconducting (SC) state the diamagnetic shielding of external field (H ext) is different for the different sites of iron. Ionic spin relaxation (ISR) effects are present at low temperature.
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