Thermodynamic properties of the two-dimensional spin-1/2 Heisenberg antiferromagnet at finite temperature: A finite-cluster-expansion approach

1992 ◽  
Vol 45 (5) ◽  
pp. 2282-2284 ◽  
Author(s):  
Jian Wang
Keyword(s):  
Thermodynamic Properties ◽  
Cluster Expansion ◽  
Finite Temperature ◽  
Two Dimensional ◽  
Heisenberg Antiferromagnet

scholarly journals Thermodynamics of the Planar Hubbard Model

2003 ◽  
Vol 17 (18n20) ◽  
pp. 3377-3380 ◽  
Author(s):  
J. Bonča ◽  
P. Prelovšek
Keyword(s):  
Thermodynamic Properties ◽  
Hubbard Model ◽  
Specific Heat ◽  
Electron Density ◽  
Finite Temperature ◽  
Lanczos Method ◽  
Two Dimensional ◽  
Phase Averaging ◽  
Half Filling ◽  
Additional Phase

The thermodynamic properties: specific heat and entropy are studied as a function of temperature and doping within the two-dimensional Hubbard model with various U/t=4-12. Quantities are calculated using the finite-temperature Lanczos method with additional phase-averaging for a system of 4×4 sites. Results show that the entropy at low T reaches a maximum near half-filling at the electron density n~1±0.15 in the whole regime of studied U/t.

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