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Title:  SUPERCONDUCTIVITY AND VALENCE STATES OF CE, PR AND TB IN BULK LU1XMXBA2CU3O7DELTA (M = CE, PR AND TB) SYSTEMS 
Authors:  GNANASEKAR, KI TAMHANE, AS PINTO, R NAGARAJAN, R SHARON, M GUPTA, LC VIJAYARAGHAVAN, R 
Keywords:  thinfilms probe 
Issue Date:  1994 
Publisher:  ELSEVIER SCIENCE BV 
Citation:  PHYSICA C, 219(12), 183190 
Abstract:  Bulk samples of composition Lu1xMBa2Cu3O7delta (M=Ce, Pr and Th) are examined with respect to the formation of 123 phase and the superconducting properties. Samples with M=Pr and Tb form a superconducting 123 phase for values of x lessthanorequalto 0.6. We observe that in case of M=Tb, the zeroresistance transition temperature, T(c(0)), is 8586 K and independent of x for 0.1 lessthanorequalto x lessthanorequalto 0.3. For M=Pr, a maximum T(c(0)) of 86 K is observed for x=0.1. T(c(0)) decreases with increasing x for x>0.1 and the sample with x=0.6 is observed to be semiconducting down to 12 K. With M=Ce, samples of the composition Lu1xyCexCaBa2Cu3O7delta form the superconducting 123 phase for x, y=0.1 and 0.15. Samples of the compositions Lu1xyPrxCaBa2Cu3O7delta with x=0.1, 0.2, 0.3 and y=0.1, have lower T(c(0))'s than samples of a corresponding Pr content without Ca. We infer from our studies that the Pr ions are in the 3+ valence state for 0.1 lessthanorequalto x lessthanorequalto 0.3, the Th ions are mainly in the 3+ valence state for 0.t lessthanorequalto x lessthanorequalto 0.3, and the Ce ions are in the 4 + state. 
URI:  http://dx.doi.org/10.1016/09214534(94)900329 http://dspace.library.iitb.ac.in/xmlui/handle/10054/7023 http://hdl.handle.net/10054/7023 
ISSN:  09214534 
Appears in Collections:  Article

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