SUPERCONDUCTIVITY AND VALENCE STATE OF TB IN LU1-XTBXBA2CU3O7-DELTA LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.7)

Authors
GNANASEKAR KI SELVAM P KEER HV PINTO R PURANDARE SC TAMHANE AS GUPTA LC VIJAYARAGHAVAN R
Citation
Ki. Gnanasekar et al., SUPERCONDUCTIVITY AND VALENCE STATE OF TB IN LU1-XTBXBA2CU3O7-DELTA LESS-THAN-OR-EQUAL-TO-X-LESS-THAN-OR-EQUAL-TO-0.7), Applied physics letters, 65(10), 1994, pp. 1296-1298
Citations number
21
Categorie Soggetti
Physics, Applied
Journal title
Applied physics letters → ACNP
ISSN journal
00036951
Volume
65
Issue
10
Year of publication
1994
Pages
1296 - 1298
Database
ISI
SICI code
0003-6951(1994)65:10<1296:SAVSOT>2.0.ZU;2-N
Abstract
Although both lutetium and terbium do not form superconducting REBa2Cu 3O7-delta, we report here the formation of superconducting phase in th in films. Films are highly c-axis oriented with high current densities (3.0x10(6) A cm-2 at 77 K) observed in Lu0.5Tb0.5Ba2Cu3O7-delta. X-ra y photoelectron spectroscopic analysis of Tb in the above film indicat es that Tb is in a trivalent state. Further, as the redox potential of Tb (Tb4+ +e- --> Tb3+:E0 = 3.1 V) is close to that of Pr (Pr4+ +e- -- >Pr3+:E0 = 3.2 V), we suggest that Pr also would be in a trivalent sta te and the mechanism by which the latter depresses T(c) must be of tri valent origin.