TY - JOUR
T1 - Competition and coexistence of antiferromagnetism and superconductivity in the Hubbard model
AU - Kobayashi, Kenji
AU - Watanabe, Tsutomu
AU - Yokoyama, Hisatoshi
PY - 2010/12
Y1 - 2010/12
N2 - The interplay between antiferromagnetism (AF) and superconductivity (SC) in cuprate is studied for the two-dimensional Hubbard model with a diagonal transfer t′, using a variational Monte Carlo method. Optimizing an improved wave-function for strongly correlated values of U/t, we construct a phase diagram. It is found that the stable state is sensitive to the value of model parameters: For t′/t ≳ -0.15 a coexisting state is realized, whose range of doping rate extends as t′/t increases. In contrast, for t′/t = -0.3, AF and SC states are mutually exclusive, and the area of pure AF shrinks as U/t increases.
AB - The interplay between antiferromagnetism (AF) and superconductivity (SC) in cuprate is studied for the two-dimensional Hubbard model with a diagonal transfer t′, using a variational Monte Carlo method. Optimizing an improved wave-function for strongly correlated values of U/t, we construct a phase diagram. It is found that the stable state is sensitive to the value of model parameters: For t′/t ≳ -0.15 a coexisting state is realized, whose range of doping rate extends as t′/t increases. In contrast, for t′/t = -0.3, AF and SC states are mutually exclusive, and the area of pure AF shrinks as U/t increases.
KW - Cuprate
KW - Hubbard model
KW - Superconductivity
KW - Variational Monte Carlo method
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U2 - 10.1016/j.physc.2009.10.058
DO - 10.1016/j.physc.2009.10.058
M3 - Article
AN - SCOPUS:78649710585
SN - 0921-4534
VL - 470
SP - S947-S948
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - SUPPL.1
ER -