Infrared signatures of the spin-Peierls transition in CuGeO3

Abstract

We investigated the infrared reflectivity of several Mg- and Si-substituted CuGeO3 single crystals. The temperature dependent b-axis and c-axis optical response is reported. For T<Tsp we detected the activation of zone-boundary phonons along the b axis of the crystal on the pure sample and for 1% Mg and 0.7% Si concentrations. From a detailed analysis of the phonon parameters the redshift of the B2u mode at 48 cm^-1 is observed and discussed in relation to the soft mode expected to drive the spin-Peierls phase transition in CuGeO3. Moreover, the polarization dependence of a magnetic excitation measured in transmission at 44 cm^-1 has been investigated.

Revtex, 3 pages, 5 postscript pictures, submitted to PRB Rapid Communications

References in corpus (2)

• Double gap and solitonic excitations in the spin-Peierls chain CuGeO3
• Symmetry and dimension of the magnon dispersion of inorganic spin-Peierls systems

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