2003/03/15 by J. Janaki, T. Geetha Kumary, R. Nagarajan +5
Physics and Astronomy · #cond-mat.supr-con
published as Materials Chemistry and Physics 75 (2002) 110-116 · 7 pages, 6 figures, latex, contact: [email protected]
arxiv created 2003/03/15 · arxiv updated 2009/11/30
In order to explore the possibility of tuning superconducting and ferromagnetic transitions by Cu doping (for Ru) in GdSr2RuCu2O8, we have carried out synthesis and characterization of GdSr2Ru1-xCu2+x)O8 (x = 0, 0.05, 0.1, 0.2) and studied their physical properties. Coexistence of superconductivity and ferromagnetism is observed in all the Cu doped samples studied here. The zero field susceptibility data suggests formation of a spontaneous vortex phase. Cu doping decreases the ferromagnetic Curie temperature, whereas the superconducting transition temperature increases until an optimal concentration x~0.1. This reflects an increase in hole transfer to the CuO2 planes and reduction of ferromagnetic order within the ruthenate layers.