n - Doped superconducting compounds: Granular and pressure effects

✍ Scribed by A. Gerber; J. Beille; T. Grenet; M. Cyrot

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 367 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80356-6

✦ Synopsis

We studied the superconducting properties of the electron-doped compounds Ln2_xMxCU04_y (Ln = Pr, Nd, Sm, Eu; M = Ce and Th). The granular structure of the samples influences strongly theIr superconducting behavior, causing an unusual "double -peak" resistive transition in low magnetic fields. The intragrain transition temperature was found to vary weakly in the series of the studied compounds in contrast with the macroscopic resistive transition midpoint. The ceramics remain superconducting under quasihydrostatic pressure up to 100 kbar. We found that the chemical pressure alone can't be responsible for the absence of superconductivity in the Od -based compound.