Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819916 | Physica C: Superconductivity and its Applications | 2007 | 4 Pages |
Abstract
With a mind to superconductivity (SC) arising in Sr2RuO4, we study a Hubbard model on square lattice including second-neighbor hopping tâ², using an optimization variational Monte Carlo method. As a pairing state, we have chosen dx2-y2(d) wave for singlet and px (p)-wave for triplet pairing state. In the trial wave functions, a doublon-holon binding effect is introduced in addition to the onsite Gutzwiller projection. By calculating condensation energies of the SC states, we found that when tâ²Â = â0.4t, the d-wave state is stabilized against the normal state for 0.6 < n < 1. On the other hand, p-wave state is never stabilized in this regime. Based on this result, it is difficult to understand a spin-triplet state simply from the single-band Hubbard model with onsite Coulomb interaction.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
Shogo Fujita, Tsutomu Watanabe, Seiichiro Onari, Hisatoshi Yokoyama, Yukio Tanaka, Jun-ichiro Inoue,