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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/9821

Title: Annealing effects in (Hg,Cr)Sr2CuO4+delta: Transport and X-ray absorption studies
Authors: BALAMURUGAN, S
GUPTA, S
PADALIA, BD
PRAKASH, O
GOPALAKRISHNAN, IK
YAKHMI, JV
SELVAM, P
Keywords: neutron powder diffraction
mercury-based superconductors
cu-o system
t-c
crystal-structure
high-pressure
oxide superconductors
k superconductor
hgba2cuo4+delta
oxygen
Issue Date: 2001
Publisher: KLUWER ACADEMIC/PLENUM PUBL
Citation: JOURNAL OF SUPERCONDUCTIVITY, 14(3), 429-435
Abstract: Superconducting (Hg1-xCrx)Sr(2)CuO(4+delta,)x similar to 0.36, samples of 1201-type synthesized in partial vacuum, show T-c(onset) of similar to 58 K, T-c (R = 0) similar to 52 K. It is found that T-c is not affected by the subsequent Ar or O-2 annealing treatment. Remarkably, the annealed samples show significant improvement in the diamagnetic signal. Hg L-3-edge measurements on 1201 samples show divalent state of mercury. The Cu K-edge spectra for the samples, after taking due account of the impurity phases. show noticeable modifications in the split main peak features on Ar or O-2 annealing, suggesting changes in the crystal field asymmetry. In the superconducting (SC) samples, a weak but distinct signature of Cu1+ is seen. The Cu1+ feature is absent in all the non-SC 1201 samples as well as in the impurity phase SrCuO2 and Sr2CuO3 samples. An attempt is made to explain the observed Cu1+ feature in SC (Hg,Cr)-1201 in the light of the available reports.
URI: http://dx.doi.org/10.1023/A:1011194926498
http://dspace.library.iitb.ac.in/xmlui/handle/10054/9821
http://hdl.handle.net/10054/9821
ISSN: 0896-1107
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