Comparison of superconductivity in Sr_2RuO_4 and copper oxides

Details Comparison of superconductivity in Sr_2RuO_4 and copper oxides Comparison of superconductivity in Sr_2RuO_4 and copper oxides

1999-03-20

arxiv.org/abs/cond-mat/9903314v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTEX, 3 figs. Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevB.61.15392

To compare the superconductivity in strongly correlated electron systems with the antiferromagnetic fluctuations in the copper oxides and with the ferromagnetic fluctuations in Sr_2RuO_4 a t-J-I model is proposed. The antiferromagnetic coupling J results in the superconducting state of d_{x^2-y^2} 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 T_c values, for the typical values of the coupling constants: T_c of order of 1K for the ruthenate and T_c of order of 100K for the cuprates.

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