The microscopic spin-phonon coupling constants in CuGeO_3

Details The microscopic spin-phonon coupling constants in CuGeO_3 The microscopic spin-phonon coupling constants in CuGeO_3

1998-10-05

arxiv.org/abs/cond-mat/9810038v2

Phys. Rev. B, Vol. 59, 14 356 (1999)

Physics

Condensed Matter

11 pages, two figures, 13 tables, PRB 59 (in press)

Scientific paper

10.1103/PhysRevB.59.14356

Using RPA results, mean field theory, and refined data for the polarization vectors we determine the coupling constants of the four Peierls-active phonon modes to the spin chains of CuGeO_3. We then derive the values of the coupling of the spin system to the linear ionic displacements, the bond lengths and the angles between bonds. Our values are consistent with microscopic theories and various experimental results. We discuss the applicability of static approaches to the spin-phonon coupling. The c-axis anomaly of the thermal expansion is explained. We give the values of the coupling constants in an effective one-dimensional Hamiltonian.

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