Abstract
Using the two-dimensional Hubbard model with a moderate value of on-site Coulomb energy U=5 (energy unit is t, nearest-neighbor transfer energy), we have computed, by means of the variational Monte Carlo method, the condensation energy E{sub cond} of the d-wave superconducting state for square lattices of sizes from 10 x 10 to 22 x 22. The second-neighbor transfer energy t{sup '} was fixed at -0.05 in the middle of the t{sup '} region where SDW was found vanishing or very weak in a preceding work. With the electron density kept at about 0.84, E{sub cond} was found to have only a weak dependence on the lattice size, indicating the existence of a finite bulk-limit value, which is close to the observed value. Although a considerable size effect was found even in largest lattice cases, the above results suggest that the high-T{sub c} superconductivity in the cuprates at the optimal doping can be explained in terms of the present model.
Citation Formats
Yamaji, K, Yanagisawa, T, and Miyazaki, M.
Consistent picture for high T{sub c} and SDW obtained from the moderate-U Hubbard model.
Netherlands: N. p.,
2004.
Web.
doi:10.1016/j.physc.2003.11.071.
Yamaji, K, Yanagisawa, T, & Miyazaki, M.
Consistent picture for high T{sub c} and SDW obtained from the moderate-U Hubbard model.
Netherlands.
https://doi.org/10.1016/j.physc.2003.11.071
Yamaji, K, Yanagisawa, T, and Miyazaki, M.
2004.
"Consistent picture for high T{sub c} and SDW obtained from the moderate-U Hubbard model."
Netherlands.
https://doi.org/10.1016/j.physc.2003.11.071.
@misc{etde_20618644,
title = {Consistent picture for high T{sub c} and SDW obtained from the moderate-U Hubbard model}
author = {Yamaji, K, Yanagisawa, T, and Miyazaki, M}
abstractNote = {Using the two-dimensional Hubbard model with a moderate value of on-site Coulomb energy U=5 (energy unit is t, nearest-neighbor transfer energy), we have computed, by means of the variational Monte Carlo method, the condensation energy E{sub cond} of the d-wave superconducting state for square lattices of sizes from 10 x 10 to 22 x 22. The second-neighbor transfer energy t{sup '} was fixed at -0.05 in the middle of the t{sup '} region where SDW was found vanishing or very weak in a preceding work. With the electron density kept at about 0.84, E{sub cond} was found to have only a weak dependence on the lattice size, indicating the existence of a finite bulk-limit value, which is close to the observed value. Although a considerable size effect was found even in largest lattice cases, the above results suggest that the high-T{sub c} superconductivity in the cuprates at the optimal doping can be explained in terms of the present model.}
doi = {10.1016/j.physc.2003.11.071}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}
title = {Consistent picture for high T{sub c} and SDW obtained from the moderate-U Hubbard model}
author = {Yamaji, K, Yanagisawa, T, and Miyazaki, M}
abstractNote = {Using the two-dimensional Hubbard model with a moderate value of on-site Coulomb energy U=5 (energy unit is t, nearest-neighbor transfer energy), we have computed, by means of the variational Monte Carlo method, the condensation energy E{sub cond} of the d-wave superconducting state for square lattices of sizes from 10 x 10 to 22 x 22. The second-neighbor transfer energy t{sup '} was fixed at -0.05 in the middle of the t{sup '} region where SDW was found vanishing or very weak in a preceding work. With the electron density kept at about 0.84, E{sub cond} was found to have only a weak dependence on the lattice size, indicating the existence of a finite bulk-limit value, which is close to the observed value. Although a considerable size effect was found even in largest lattice cases, the above results suggest that the high-T{sub c} superconductivity in the cuprates at the optimal doping can be explained in terms of the present model.}
doi = {10.1016/j.physc.2003.11.071}
journal = []
issue = {1-2}
volume = {412-414}
journal type = {AC}
place = {Netherlands}
year = {2004}
month = {Oct}
}