Abstract
Using a variational Monte Carlo method, we discuss the interplay between antiferromagnetism (AF) and superconductivity (SC) in a Hubbard model on a square lattice with a diagonal transfer t′. We simultaneously introduce the following improvements into the trial function: (1) coexistence of AF and d-wave singlet gaps that allows a continuous description of their interplay, (2) band renormalization effect in the range of fourth-neighbor hopping, and (3) refined doublon-holon correlation factors. For t′ / t = - 0.3, appropriate to hole-doped cuprates, it is found that AF ordered state is stabilized near half filling, especially, for U ∼ band width, by retrieving the nesting condition. As the doping rate increases, AF is weakened and a pure d-wave SC phase evolves for large U. The coexisting state of SC and AF orders appears only in a narrow range of U (∼ band width) and electron density n (= 0.8).
Original language | English |
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Pages (from-to) | 3274-3276 |
Number of pages | 3 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 69 |
Issue number | 12 |
DOIs | |
Publication status | Published - 2008 Dec |
Keywords
- A. Oxides
- D. Electronic structure
- D. Fermi surface
- D. Magnetic properties
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics