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Comparison of Electronic Structure, Magnetic Mechanism, and Symmetry of Pairing in Ruthenates and Cuprates

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Book cover Ruthenate and Rutheno-Cuprate Materials

Part of the book series: Lecture Notes in Physics ((LNP,volume 603))

Abstract

A generalized tight-binding (GTB) method is developed to calculate quasiparticle band structure with explicit account for strong electronic correlations. The GTB method combines exact diagonalization of the multi-orbital p-d model Hamiltonian within the unit cell and the perturbation theory in the Hubbard X-operators form for the inter-cell hopping and interactions. For undoped cuprates we obtain the valence band structure in excellent agreement with ARPES data, evolution of the band structure with doping with an in-gap state at small doping, impurity-like band at higher doping to optimally doped metal. The effective low-energy Hamiltonian has the form of singlet-triplet t-J model. For ruthenates the t-J-I model is proposed with both antiferromagnetic J and ferromagnetic I couplings. In the strong correlation limit, the mean-field theory of superconductivity results in d-wave singlet pairing mediated by J (cuprates) and p-wave triplet one mediated by I (ruthenates) with ratio T c (d)/T c (p) ∼ 100 due to the different symmetry of the gap. The competition of ferromagnetic and antiferromagnetic order in rutheno-cuprates is also discussed.

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Authors and Affiliations

  1. L.V. Kirensky Institute of Physics, Siberian Branch of RAS, Russia

    S. G. Ovchinnikov

  2. UNESCO Chair of New Materials and Technology, Krasnoyarsk State Technical University, Krasnoyarsk, 660036, Russia

    S. G. Ovchinnikov

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  1. S. G. Ovchinnikov
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  1. Dipartimento di Fisica “E.R. Caianiello” Facoltá di Scienze, Universitá di Salerno, Via Salvator Allende, 84081, Baronissi (Salerno), Italy

    C. Noce , A. Vecchione , M. Cuoco  & A. Romano , ,  & 

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Ovchinnikov, S.G. (2002). Comparison of Electronic Structure, Magnetic Mechanism, and Symmetry of Pairing in Ruthenates and Cuprates. In: Noce, C., Vecchione, A., Cuoco, M., Romano, A. (eds) Ruthenate and Rutheno-Cuprate Materials. Lecture Notes in Physics, vol 603. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45814-X_16

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  • DOI: https://doi.org/10.1007/3-540-45814-X_16

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  • Print ISBN: 978-3-540-44275-2

  • Online ISBN: 978-3-540-45814-2

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