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Cooperative phenomena in ternary superconductors

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Abstract

A microscopic theory of ferromagnetic superconductors is developed from first principles. Self-consistent equations for the superconducting order parameter Δ and spontaneous magnetizations 〈S z〉 are derived using a Green's function technique and considering thef-d exchange effect up to the second order. The theory is applied to explain the experimental results in the reentrant superconducting ternary system ErRh4B4. The present model explains reentrant behavior, predicts the coexistence of superconductivity and ferromagnetism in a very small range of temperature, the suppression of superconductivity by ferromagnetism, and vice versa. These results are in excellent agreement with the experimental data and predictions of other models. The behavior of the spontaneous magnetization, the superconducting order parameter, the specific heat, and the density of states is also studied.

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Authors and Affiliations

  1. Department of Physics, MLV Government College, Bhilwra (Raj.), India

    S. L. Kakani

  2. Department of Physics, SBSH, University of Udaipur, Udaipur (Raj.), India

    U. N. Upadhyaya

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  1. S. L. Kakani
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  2. U. N. Upadhyaya
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Kakani, S.L., Upadhyaya, U.N. Cooperative phenomena in ternary superconductors. J Low Temp Phys 53, 221–253 (1983). https://doi.org/10.1007/BF00685781

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  • DOI: https://doi.org/10.1007/BF00685781

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