Raman scattering from magnetic excitations in the ferromagnetic superconductor RuSr2GdCu2O8-delta

V. HADJIEV, A. FAINSTEIN, P. ETCHEGOIN, J. H. TRODAHL, C. BERNHARD, M. CARDONA, AND J. L. TALLON

PHYSICA STATUS SOLIDI B-BASIC RESEARCH

WILEY-V C H VERLAG GMBH

Año: 1999 vol. 211 p. 5 - 6

0370-1972

The recent discovery of hybrid ruthenocuprates has brought a new class of compounds to light in which long-range ferromagnetic ordering coexists with superconductivity . One member of this class of materials is RuSr2 GdCu2O8ÿd (Ru-1212) which has a crystal structure that consists of sequences of alternating CuO2 double planes, as those in high-Tc superconductors (HTS), and RuO2-monolayers, similar to those in SrRuO3 . The Ru-1212 compound becomes superconducting at Tc= 15 to 40 K well below the magnetic transition T Curie ˆ 133 to 136 K. Superconductivity seems to leave intact the ferromagnetic ordering of Ru-moments below Tc . In this Note we report our preliminary results concerning Raman scattering from magnetic excitations in Ru-1212.