Micro-structure and magnetization of the 80-K superconductor, TbSr2Cu2.7Mo0.3O7+δ

Abstract

The results of micro-structural and detailed magnetization studies are reported here for our recently published TbSr 2 Cu 2.7 Mo 0.3 O 7+δ superconductor with a transition temperature (T c ) at as high as 80 K [1]. From XRD and EDX the sample was confirmed to be of single-phase and possess the nominal cation stoichiometry. The SEM images showed well-developed grains for this ceramic high-T c superconductor. Magnetization measurements at various temperatures and fields revealed bulk superconductivity below 80 K. Magnetization versus applied field (M vs. H) loops at various temperatures below the T c exhibited clear full penetration field H P . In normal state (> 100 K) the susceptibility follows the Curie-Weiss behavio r with an effective paramagnetic moment of 9.83 µ B .