期刊
PHYSICAL REVIEW B
卷 78, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.78.060502
关键词
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资金
- NSF [DMR-0706379, DMR-0312680]
- DOE CMSN [DE-FG02-04ER46129]
- National Science Foundation
- [PES0609]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0955980] Funding Source: National Science Foundation
We study the effect of long-range hoppings on T-c for the two-dimensional (213) Hubbard model with and without Holstein phonons using parameters evaluated from band-structure calculations for cuprates. Employing the dynamical cluster approximation (DCA) with a quantum Monte Carlo (QMC) cluster solver for a 4-site cluster, we observe that without phonons, the long-range hoppings, t' and t '', generally suppress T-c We argue that this trend remains valid for larger clusters. In the presence of the Holstein phonons, a finite t' enhances T-c in the under-doped region for the hole-doped system, consistent with local-density approximation (LDA) calculations and experiment. This is interpreted through the suppression of antiferromagnetic (AF) correlations and the interplay between polaronic effects and the antiferromagnetism.
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