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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9839

Title: Transport and CuK-XANES studies of (Hg,Cr)Sr-2(Ca,Y)Cu2O6+delta
Authors: BALAMURUGAN, S
PRAKASH, O
PADALIA, BD
GOPALAKRISHNAN, IK
YAKHMI, JV
SELVAM, P
Keywords: mercury-based superconductor
neutron powder diffraction
high-pressure synthesis
t-c superconductor
x-ray-diffraction
oxide superconductors
crystal-structures
hgba2cuo4+delta
hgba2ca2cu3o8+delta
hgba2cacu2o6+delta
Issue Date: 2001
Publisher: KLUWER ACADEMIC/PLENUM PUBL
Citation: JOURNAL OF SUPERCONDUCTIVITY, 14(6), 687-691
Abstract: The nominal (Hg0.7Cr0.3)Sr-2(Ca0.7Y0.3)Cu2O6+delta, referred to as (Hg,Cr)-1212, were successfully synthesized at high temperature in partial vacuum. The samples were subsequently annealed in Ar or O-2 annealed at 300degreesC under ambient pressure. No T-c was observed in any of these samples down to 12 K which is in contrast to high pressure synthesized Y-free (Hg,Cr)-1212 phase where the latter exhibits a superconductivity at similar to80K. The divalent state of Cu,as shown by XANES in the as-prepared (Hg,Cr)-1212, is not affected either by Ar or O-2 annealing. Depletion of holes due to trivalent Y substitution at the Ca-site, and a relatively higher 'a' lattice parameter ( greater than or equal to3.851 Angstrom) are the apparent reasons for the non-superconducting nature of the samples.
URI: http://dx.doi.org/10.1023/A:1013243709396
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9839
http://hdl.handle.net/10054/9839
ISSN: 0896-1107
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