Granular superconductivity and phase separation in Ru1212Eu

✍ Scribed by Y.Y. Xue; B. Lorenz; A. Baikalov; J. Cmaidaka; F. Chen; R.L. Meng; C.W. Chu

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 250 KB
• Volume: 408-410
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/j.physc.2004.03.090

✦ Synopsis

The magnetic and superconducting properties of RuSr 2 EuCu 2 O 10þd (Ru1212Eu) are investigated. Analysis of the magnetization and specific heat suggest that the ferromagnetic and antiferromagnetic transitions in this component are separated by Cu-doping, and that both carry comparable spin entropies. This is more in line with mesoscopic phaseseparation than cant antiferromagnetism. The equilibrium magnetization was further deduced as the function of both the external field H 2 and the demagnetizing field H dm . The data show that the FM component is along the a, b direction with a maximum H dm far larger than the apparent lower-critical-field observed. Part of the samples, therefore, should be in the spontaneous vortex state if the magnetic domains are pre-aligned above T c .