Mixed Heisenberg Chains. II. Thermodynamics

Details Mixed Heisenberg Chains. II. Thermodynamics Mixed Heisenberg Chains. II. Thermodynamics

1997-12-17

arxiv.org/abs/cond-mat/9712202v2

J. Phys.: Condens. Matter 10, p. 5217-5236 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, RevTeX, 12 embedded eps figures, cf. cond-mat/9703206, minor modifications

Scientific paper

10.1088/0953-8984/10/23/021

We consider thermodynamic properties, e.g. specific heat, magnetic susceptibility, of alternating Heisenberg spin chains. Due to a hidden Ising symmetry these chains can be decomposed into a set of finite chain fragments. The problem of finding the thermodynamic quantities is effectively separated into two parts. First we deal with finite objects, secondly we can incorporate the fragments into a statistical ensemble. As functions of the coupling constants, the models exhibit special features in the thermodynamic quantities, e.g. the specific heat displays double peaks at low enough temperatures. These features stem from first order quantum phase transitions at zero temperature, which have been investigated in the first part of this work.

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