Infrared signatures of the spin-Peierls transition in CuGeO3
A. Damascelli (1), D. van der Marel (1), F. Parmigiani (2), G., Dhalenne (3), A. Revcolevschi(3) ((1) University of Groningen, (2), Politecnico di Milano, (3) Universite De Paris-sud)
TL;DR
This study examines the infrared reflectivity of CuGeO3 crystals with Mg and Si substitutions, revealing phonon activation and soft mode behavior associated with the spin-Peierls transition.
Contribution
It provides detailed infrared spectral analysis of substituted CuGeO3, highlighting phonon shifts and magnetic excitations related to the spin-Peierls transition.
Findings
Activation of zone-boundary phonons below Tsp
Redshift of the B2u phonon mode at 48 cm^-1
Observation of magnetic excitation at 44 cm^-1
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.
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