Phys. Rev. B 58, R14677–R14680 (1998)Dynamics of the Peierls-active phonon modes in CuGeO3
We reconsider the Cross and Fischer approach to spin-Peierls transitions. We show that a soft phonon occurs only if Ω0<2.2TSP. For CuGeO3 this condition is not fulfilled and the calculated temperature dependence of the Peierls-active phonon modes is in excellent agreement with experiment. A central peak of a width ∼0.2meV is predicted at TSP. Good agreement is found between theory and experiment for the pretransitional Peierls fluctuations. Finally, we consider the problem of quantum criticality in CuGeO3. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.58.R14677
DOI:
10.1103/PhysRevB.58.R14677
PACS:
75.10.Jm, 75.25.+z
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