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On the Presence of Cu1+ in the Superconducting (Hg,M)Sr2CuO4+δ; M = Cr, Mo, or Re

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Abstract

The Cu K-edge measurements on the optimum T c 1201 compounds (Hg1−x M x )Sr2CuO4+δ (M = Cr, Mo, or Re; 0.10 ≤ x ≤ 0.30) show besides Cu2+ (predominant) a very weak but distinct signature of Cu1+, only in the superconducting (SC) samples. The Cu1+ feature is conspicuously absent when these compositions are non-superconducting because of different processing conditions. Our finding of monovalent Cu in SC (Hg,M)/Sr-1201 favors the presence of Cu at the Hg-site and this seems to facilitate superconductivity in these cuprates.

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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

    O. 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

  5. Technical Physics and Prototype Engineering Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    J. V. Yakhmi

  6. Department of Materials Chemistry, Graduate School of Engineering, Tohoku University, Aoba-yama 07, Sendai, 980-8579, Japan

    P. Selvam

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Balamurugan, S., Prakash, O., Padalia, B.D. et al. On the Presence of Cu1+ in the Superconducting (Hg,M)Sr2CuO4+δ; M = Cr, Mo, or Re. Journal of Superconductivity 16, 581–584 (2003). https://doi.org/10.1023/A:1023889525034

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