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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/4472

Title: SUPERCONDUCTIVITY AND VALENCE STATE OF TB IN LU1-XTBXBA2CU3O7-DELTA (0-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
Keywords: thin-films
pr
yba2cu3o7
y1-xprxba2cu3o7-delta
prba2cu3o7
systems
Issue Date: 1994
Publisher: AMER INST PHYSICS
Citation: APPLIED PHYSICS LETTERS, 65(10), 1296-1298
Abstract: Although both lutetium and terbium do not form superconducting REBa2Cu3O7-delta, we report here the formation of superconducting phase in thin 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-ray photoelectron spectroscopic analysis of Tb in the above film indicates 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 state and the mechanism by which the latter depresses T(c) must be of trivalent origin.
URI: http://dx.doi.org/10.1063/1.112099
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4472
http://hdl.handle.net/10054/4472
ISSN: 0003-6951
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