A Possible Crypto-superconducting Structure in a Superconducting Ferromagnet
نویسندگان
چکیده
We have measured the dc and ac electrical and magnetic properties in various magnetic fields of the recently reported superconducting ferromagnet RuSr2GdCu2O8. Our reversible magnetization measurements demonstrate the absence of a bulk Meissner state in the compound below the superconducting transition temperature. Several scenarios that might account for the absence of a bulk Meissner state, including the possible presence of a spongelike non-uniform superconducting or a crypto-superconducting structure in the chemically uniform Ru-1212, have been proposed and discussed. Submitted to Physica C (November 1, 1999); accepted for publication (Decem-
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nd - m at . s up r - co n ] 1 1 N ov 1 99 9 Absence of a Bulk Meissner State in RuSr
We have systematically investigated the magnetic, electrical, and structural properties of RuSr2GdCu2O8, in which a long-range ferromagnetic order and superconductivity have been previously reported to coexist. Based on the results, we conclude that the bulk Meissner state does not exist in this compound. The absence of a bulk Meissner state may be attributed to the formation of a spontaneous v...
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