The valence state of M-ions in the chemically stabilized YSr(2)Cu(3-x)M(x)O(7+delta) (M=Mo, W and Re) superconductors

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Title:	The valence state of M-ions in the chemically stabilized YSr(2)Cu(3-x)M(x)O(7+delta) (M=Mo, W and Re) superconductors
Authors:	MURUGESAN, M SELVAM, P SHARON, M GUPTA, LC PINTO, R GOPINATH, CS SUBRAMANIAN, S
Keywords:	ray photoelectron-spectroscopy high-pressure y1-xprxsr2cu2.7mo0.3o7-delta oxide
Issue Date:	1997
Publisher:	SPRINGER VERLAG
Citation:	APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 64(2), 177-179
Abstract:	Single phase Ba- free Sr-based YSr(2)Cu(3-x)M(x)O(7+delta) (M = Mo, W and Re) compounds have been stabilized by chemical doping. Superconductivity is observed for these phases in the range 30-45K. X-ray diffraction studies suggest a relatively small orthorhombicity compared to Ba-analogue. X-ray photoelectron spectroscopic investigations reveal that the stabilizing cations are in the hexavalent state. The observation of the higher oxidation state of M-ions accounts for the excess oxygen content in these phases which is in accordence with the diffraction results.
URI:	http://dx.doi.org/10.1007/s003390050461 http://dspace.library.iitb.ac.in/xmlui/handle/10054/12283 http://hdl.handle.net/10054/12283
ISSN:	0947-8396
Appears in Collections:	Article

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