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Transport and Cu K-XANES Studies of (Hg,Cr)Sr2(Ca,Y)Cu2O6 + δ

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Abstract

The nominal (Hg0.7Cr0.3)Sr2(Ca0.7Y0.3)Cu2O6 + δ, referred to as (Hg,Cr)-1212, were successfully synthesized at high temperature in partial vacuum. The samples were subsequently annealed in Ar or O2 annealed at 300°C 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 ∼80 K. The divalent state of Cu, as shown by XANES in the as-prepared (Hg,Cr)-1212, is not affected either by Ar or O2 annealing. Depletion of holes due to trivalent Y substitution at the Ca-site, and a relatively higher 'a' lattice parameter (≥3.851 Å) are the apparent reasons for the non-superconducting nature of the samples.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology—Bombay, Powai, Mumbai, 400 076, India

    S. Balamurugan & P. Selvam

  2. Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology—Bombay, Powai, Mumbai, 400 076, India

    Om Prakash

  3. Department of Physics, Indian Institute of Technology—Bombay, Powai, Mumbai, 400 076, India

    B. D. Padalia

  4. Novel Materials and Structural Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    I. K. Gopalakrishnan & J. V. Yakhmi

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  1. S. Balamurugan
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  4. I. K. Gopalakrishnan
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  5. J. V. Yakhmi
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  6. P. Selvam
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Balamurugan, S., Prakash, O., Padalia, B.D. et al. Transport and Cu K-XANES Studies of (Hg,Cr)Sr2(Ca,Y)Cu2O6 + δ. Journal of Superconductivity 14, 687–691 (2001). https://doi.org/10.1023/A:1013243709396

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