Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2008-07-29
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.
Herzog Adrian
Horsch Peter
Oles' Andrzej M.
Sirker Jesko
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