Superconducting States in Frustratingt–JModel: A Model Connecting High-TcCuprates, Organic Conductors and NaxCoO2
- 15 August 2003
- journal article
- Published by Physical Society of Japan in Journal of the Physics Society Japan
- Vol. 72 (8), 1839-1842
- https://doi.org/10.1143/jpsj.72.1839
Abstract
The two-dimensional t-J model on a frustrating lattice is studied using mean-field variational theories with Gutzwiller approximation. We find that a superconducting state with broken time-reversal symmetry (d+id state) is realized in the parameter region close to the triangular lattice. The frustration enlarges the region of superconductivity when $t0$ for electron doping. We also discuss the SU(2) degeneracy at half-filling. The d+id state probably corresponds to the spin gap state at half-filling.Comment: 4 pages, 4 figure
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