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Theoretical Study of Magnetic Behavior in Ru-based Ferromagnetic Superconductors

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Abstract

A microscopic theory of interplay of superconductivity and ferromagnetism in hybrid rutheno-cuprate superconductors RuSr2RECu2O8 (Ru-1212) (RE=Gd, Eu) is developed from first principles considering s–f model. Self-consistent equations for superconducting order parameter Δ and ferromagnetic order parameter 〈S Z〉 are obtained using Green’s function technique and equation of motion method. The theory is applied to explain the experimental results for RuSr2RECu2O8 system. This model clearly predicts the coexistence of superconductivity and spatially uniform ferromagnetism in RuSr2RECu2O8. The theory shows that it is possible to become superconducting if the system is already ferromagnetic. Study of specific heat, density of states, free energy, critical field, and ac spin susceptibility is also presented. Agreement between experimental results and theory is quite convincing.

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Authors and Affiliations

  1. Department of Physics, M.L.V. Government College, Bhilwara, 311001, Rajasthan, India

    Shubhra Kakani & K. C. Pancholi

  2. Institute of Technology and Management, N.H. 79, Chittor Road, Bhilwara Bye- pass, Bhilwara, 311001, Rajasthan, India

    S. L. Kakani

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  1. Shubhra Kakani
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  2. K. C. Pancholi
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  3. S. L. Kakani
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Correspondence to S. L. Kakani.

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Kakani, S., Pancholi, K.C. & Kakani, S.L. Theoretical Study of Magnetic Behavior in Ru-based Ferromagnetic Superconductors. J Supercond Nov Magn 23, 237–245 (2010). https://doi.org/10.1007/s10948-009-0521-6

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  • DOI: https://doi.org/10.1007/s10948-009-0521-6

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