Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2005-12-20
Adv. Phys. 56 (2007) 465
Physics
Condensed Matter
Statistical Mechanics
90 pages, 33 figures, extensive revision
Scientific paper
10.1080/00018730701265383
(abbreviated) This article considers recent advances in the investigation of the thermal and magnetic properties of integrable spin ladder models and their applicability to the physics of real compounds. The ground state properties of the integrable two-leg spin-1/2 and the mixed spin-(1/2,1) ladder models at zero temperature are analyzed by means of the Thermodynamic Bethe Ansatz. Solving the TBA equations yields exact results for the critical fields and critical behaviour. The thermal and magnetic properties of the models are investigated in terms of the recently introduced High Temperature Expansion method, which is discussed in detail. It is shown that in the strong coupling limit the integrable spin-1/2 ladder model exhibits three quantum phases: (i) a gapped phase in the regime $H
Batchelor Murray T.
Guan X.-W.
Oelkers Norman
Tsuboi Zengo
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