Ferromagnetism was found to coexist with superconductivity in Dy-doped BiPbSrCaCuO-2212 single crystals up to the superconducting critical temperature T-c similar to 80 X. Several experimental tests indicated that the phenomenon is intrinsic to the entire specimen rather than due to separate phases or to isolated impurities.
Henrik Moodysson Rønnow, Ivica Zivkovic, Richard Gaal, Youngro Lee
Pierluigi Bruzzone, Kamil Sedlák, Roberto Guarino, Evgeny Solodko