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 sponge-like non-uniform superconducting or a crypto-superconducting structure in the chemically uniform Ru-1212, have been proposed and discussed.
@article{arxiv.cond-mat/0002212,
title = {A Possible Crypto-Superconducting Structure in a Superconducting Ferromagnet},
author = {C. W. Chu and Y. Y. Xue and S. Tsui and J. Cmaidalka and A. K. Heilman and B. Lorenz and R. L. Meng},
journal= {arXiv preprint arXiv:cond-mat/0002212},
year = {2009}
}
Comments
8 pages, 5 PNG figures, submitted to Proceedings of the 9th Japan-US Workshop on High-Tc Superconductors, Yamanashi, Japan, October 13-15, 1999; accepted for publication in Physica C (December 24, 1999)