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
Citation
M. Murugesan et al., 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, Applied physics A: Materials science & processing, 64(2), 1997, pp. 177-179
Citations number
16
Categorie Soggetti
Physics, Applied
Journal title
Applied physics A: Materials science & processing → ACNP
ISSN journal
09478396
Volume
64
Issue
2
Year of publication
1997
Pages
177 - 179
Database
ISI
SICI code
0947-8396(1997)64:2<177:TVSOMI>2.0.ZU;2-P
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. Superconduc tivity is observed for these phases in the range 30-45K. X-ray diffrac tion studies suggest a relatively small orthorhombicity compared to Ba -analogue. X-ray photoelectron spectroscopic investigations reveal tha t the stabilizing cations are in the hexavalent state. The observation of the higher oxidation state of M-ions accounts for the excess oxyge n content in these phases which is in accordence with the diffraction results.