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Annealing Effects in (Hg,Cr)Sr2CuO4+δ: Transport and X-Ray Absorption Studies

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Abstract

Superconducting (Hg1−x Cr x )Sr2CuO4+δ, x ∼ 0.36, samples of 1201-type, synthesized in partial vacuum, show T c onset of ∼58 K, T c (R = 0) ∼52 K. It is found that T c is not affected by the subsequent Ar or O2 annealing treatment. Remarkably, the annealed samples show significant improvement in the diamagnetic signal. Hg L3-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 O2 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.

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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 Physics, Indian Institute of Technology Bombay, Powai, Mumbai, 400 076, India

    Sanjay Gupta & B. D. Padalia

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

    Om Prakash

  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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Balamurugan, S., Gupta, S., Padalia, B.D. et al. Annealing Effects in (Hg,Cr)Sr2CuO4+δ: Transport and X-Ray Absorption Studies. Journal of Superconductivity 14, 429–435 (2001). https://doi.org/10.1023/A:1011194926498

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