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Oxidation state and superconducting properties of Y1-xPrxSr2Cu2.85Re0.15O7+delta

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Title Oxidation state and superconducting properties of Y1-xPrxSr2Cu2.85Re0.15O7+delta
 
Creator MURUGESAN, M
SELVAM, P
SHARON, M
GUPTA, LC
PINTO, R
RAO, MSR
GOPINATH, CS
SUBRAMANIAN, S
 
Subject magnetic order
valence state
pr
y1-xprxsr2cu2.7mo0.3o7-delta
yba2cu3o7-delta
hybridization
system
fe
re
tb
 
Description Superconductivity exists in orthorhombic Y1-xPrxSr2Cu2.85Re0.15O7+delta up to a critical concentration (x(cr)) of 0.65. A progressive decrease in T-c occurs as x increases from 0 to 0.65. A further increase in x leads to a tetragonal transformation and as a consequence the Ti vanishes; however, the orthorhombicity of these Sr-based compounds is much lower than that observed for the Ba analog, Y1-xPrxBa2Cu3O7-delta and, hence, the T-c. On the one hand, crystal chemistry correlations indicate that the Pr ion is in trivalent state while on the other hand, the stabilizing cation, viz., Re, is in hexavalent state which accounts for the excess oxygen (>7.0) in the system, The high x(cr) value of the Sr series compared to the Pa series (x(cr)=0.55) is attributed to the much reduced orbital overlap of the trivalent Pr(4f) state with the Cu(3d(x2-y2))-O(2p) conduction band, via hole localization and/or pair breaking, and is not due to the much discussed hole filling by tetravalent Pr. (C) 1996
 
Publisher AMER INST PHYSICS
 
Date 2011-07-16T11:25:00Z
2011-12-26T12:49:44Z
2011-12-27T05:35:23Z
2011-07-16T11:25:00Z
2011-12-26T12:49:44Z
2011-12-27T05:35:23Z
1996
 
Type Article
 
Identifier JOURNAL OF APPLIED PHYSICS, 80(12), 6884-6887
0021-8979
http://dx.doi.org/10.1063/1.363758
http://dspace.library.iitb.ac.in/xmlui/handle/10054/4414
http://hdl.handle.net/10054/4414
 
Language en