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VOLUME 52 (1990) | ISSUE 10 | PAGE 1146
Magnetic ordering of Fe atoms in the superconductor YBa2(Cu0.95Fe0.05)3O7.01
Magnetic ordering of iron atoms in the superconducting state (y = 7.01) and in the nonsuperconducting state (y = 6.48) has been observed in a YBa2(Cu0 95 Fe005 )3Oy sample by means of Mossbauer spectroscopy. In a superconducting sample the superconductivity was found to coexist with the magnetic ordering of Fe atoms at the Cu (1) sites. In a semiconductor sample the Fe atoms at the Cu (1) sites become magnetically ordered at a temperature TM =s 20 K. This temperature decreases by 10 К upon transition to the superconducting state.