Thermally activated Peierls dimerization in ferromagnetic spin chains

Details Thermally activated Peierls dimerization in ferromagnetic spin chains Thermally activated Peierls dimerization in ferromagnetic spin chains

2008-07-29

arxiv.org/abs/0807.4693v1

Phys. Rev. Lett. 101, 157204 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.101.157204

We demonstrate that a Peierls dimerization can occur in ferromagnetic spin chains activated by thermal fluctuations. The dimer order parameter and entanglement measures are studied as functions of the modulation of the magnetic exchange interaction and temperature, using a spin-wave theory and the density-matrix renormalization group. We discuss the case where a periodic modulation is caused by spin-phonon coupling and the case where electronic states effectively induce such a modulation. The importance of the latter for a number of transition metal oxides is highlighted.

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