Comparison of superconductivity in Sr2RuO4 and copper oxides
E. V. Kuz'min, S. G. Ovchinnikov
Abstract
To compare the superconductivity in strongly correlated electron systems with the antiferromagnetic fluctuations in the copper oxides and with the ferromagnetic fluctuations in Sr2RuO4 a t-J-I model is proposed. The antiferromagnetic coupling J results in the superconducting state of dx2-y2 symmetry and the ferromagnetic coupling constant I results in the spin-triplet p-type state. The difference in the gap anisotropies provides the large difference in Tc values, for the typical values of the coupling constants: Tc of order of 1K for the ruthenate and Tc of order of 100K for the cuprates.
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