BOND VALENCE SUM, HOLE DENSITY AND IRREVERSIBILITY LINE IN CA SUBSTITUTED YSRBACU3-YMYO6+Z (M=AL,FE,CO)

Authors
SURYANARAYANAN R OUHAMMOU L RAO MSR GOROCHOV O PANKOWSKA H LENAGARD N DAS A
Citation
R. Suryanarayanan et al., BOND VALENCE SUM, HOLE DENSITY AND IRREVERSIBILITY LINE IN CA SUBSTITUTED YSRBACU3-YMYO6+Z (M=AL,FE,CO), Journal of alloys and compounds, 195(1-2), 1993, pp. 323-326
Citations number
18
Categorie Soggetti
Chemistry Physical","Metallurgy & Mining","Material Science
Journal title
Journal of alloys and compounds → ACNP
ISSN journal
09258388
Volume
195
Issue
1-2
Year of publication
1993
Pages
323 - 326
Database
ISI
SICI code
0925-8388(1993)195:1-2<323:BVSHDA>2.0.ZU;2-I
Abstract
Structural and superconducting properties of Y1-xCaxSrBaCu3-yMyO6+z (M =Al,Fe,Co) are presented. For x=0, for all M, T(c) decreases as a func tion of y and insulating state is obtained for y=0.4 accompanied by a decrease in the carrier density (p) and the Cu-O apical distance (d). For x>0, superconductivity is restored (for y=0.4). A relation between x, T(c), p, d and bond valence sum of Cu2 is obtained. Further in the case of M=Co and y=0.3, an enhancement in the irreversibility line as determined by ac susceptibility measurements is observed.