SUPERCONDUCTIVITY AND NORMAL-STATE MAGNETISM OF CALABACU3-XCOXO7 SUPERCONDUCTOR

The results of superconductivity and normal-state magnetism of the CaL aBaCu3-xCoxO7 superconductor for x = 0.0-0.24 are studied by X-ray dif fraction and SQUID magnetization. The transition temperature T-c of th e samples, determined from AC susceptibility measurements decreases wi th an increase in the dopant Co concentration. The normal-state high-f ield (5 kOe) DC magnetism inferred that the pure sample (x = 0.0) has a small and nearly temperature-independent molar susceptibility, while the Co-doped samples follows the Curie-Weiss relation in terms of the paramagnetic moment on the dopant Co. (C) 1998 Elsevier Science B.V. All rights reserved.