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Effect of Spinfluctuation Due to c- and f-Electrons on the Superconducting Gap of Cuprates

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We propose here a spin fluctuation mediated superconductivity for high temperature copper oxide superconductors. The Hamiltonian consists of superconductivity and spin–spin interaction due to 3d electrons of copper ions and spin fluctuation due to f-electrons which are coupled to the copper spins via Kondo exchange. The spin interactions are considered within the mean-field approximation so that the mean-field Hamiltonian can be diagonalised. The superconducting gap and the anti-ferromagnetic gaps due to c- and f-electrons are calculated by Green's function technique and are computed self-consistently. These temperature dependent gap parameters are varied by changing superconducting coupling, c-electron magnetic coupling, f-electron magnetic coupling and Kondo coupling. It is observed that there is a strong interplay between superconductivity and two different spin interactions. The results are discussed based on the experimental data.
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Document Type: Research Article

Publication date: February 1, 2016

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  • ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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