Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-03-10
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages, 11 figures
Scientific paper
Using an approximation method for eigenvalue distribution functions, we study the temperature dependence of specific heat of the antiferromagnetic Heisenberg model on the asymmetric railroad-trestle lattice. This model contains both the sawtooth-lattice and Majumdar-Ghosh models as special cases. Making extrapolations to the thermodynamic limit using finite size data up to 28 spins, it is found that specific heat of the Majumdar-Ghosh model has a two-peak structure in its temperature dependence and those of systems near the sawtooth-lattice point have a three-peak structure.
Fukumoto Yoshiyuki
Takemura Shunsuke
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