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We report a 57 Fe Mossbauer study of superconducting samples of YBa 2 Cu 3 O 7 substituted with 1% Fe and also, in addition, up to 4% Co. Increasing the Co level has no influence on the 57 Fe quadrupole interactions but strongly increases the saturated 57 Fe hyperfine fields. For the sample with 4% Co, where the increased hyperfine field...
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