Spin-wave theory for dimerized ferromagnetic chains

Details Spin-wave theory for dimerized ferromagnetic chains Spin-wave theory for dimerized ferromagnetic chains

2009-06-09

arxiv.org/abs/0906.1758v1

J. Phys.: Conf. Ser. 200 022017 (2010)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 2 figures

Scientific paper

10.1088/1742-6596/200/2/022017

We describe a Peierls dimerization which occurs in ferromagnetic spin chains at finite temperature, within the modified spin-wave theory. Usual spin-wave theory is modified by introducing a Lagrange multiplier which enforces a nonmagnetic state at finite temperature. It is shown that this method gives results in excellent agreement with the density--matrix renormalization group applied to transfer matrices for dimerized ferromagnetic chains. We study bond correlation functions and explore the characteristic features of dimerization in the specific heat.

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