Perturbative study of thermodynamic properties for the two-leg spin ladder

X. Y. Chen, Qing Jiang, Wen Zhong Shen

J. Jahangiri, Fatemeh Amiri, S. Mahdavifar

Yang Zhao, Wei Li, Bin Xi +5 more

The unusual ground state and thermodynamic properties of spin-(1/2) two-leg honeycomb (HC) spin ladder are systematically studied by jointly utilizing various analytical and numerical methods. The HC spin ladder is found to exhibit behaviors dramatically different from those of the conventional square spin ladder. A strong relevant term and a half saturation magnetization plateau that can be attributed to the formation of diluted dimer states are observed in the HC ladder, both of which are absent in the square ladder. The ground state phase diagram of the HC spin ladder is identified, and the thermodynamic properties of the specific heat and susceptibility for different couplings are thoroughly explored, where two kinds of excitations are unveiled. Our calculated result is well fitted to the experimental data of the two-leg HC spin ladder compound [Cu 2 L 1 (N 3 ) 4 ] n .

Matthias Troyer, Beat Frischmuth, Beat Ammon

H. Y. Shik, Ru Chen

Vladyslav O. Cheranovskii, A. A. Chovpan, E. V. Ezerskaya +1 more

Abstract We studied the energy spectrum and some finite temperature properties of two‐leg spin‐1/2 ladder with XXZ interactions in legs and rungs. It is shown that for a strong ferromagnetic interchain interaction, there is a first‐order transition between ferromagnetic and nonmagnetic phases. The anisotropic ladder in the magnetic field may have up to four low‐temperature maxima in the temperature dependence of specific heat. © 2006 Wiley Periodicals, Inc. Int J Quantum Chem, 2006