Infrared signatures of the spin-Peierls transition in CuGeO3

(2) Politecnico di Milano; (3) Universite De Paris-sud); A. Damascelli (1); A. Revcolevschi(3) ((1) University of Groningen; D. van der Marel (1); F. Parmigiani (2); G. Dhalenne (3)

arxiv: cond-mat/9708026 · v1 · submitted 1997-08-04 · ❄️ cond-mat.str-el

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) This is my paper

classification ❄️ cond-mat.str-el

keywords cugeo3infraredinvestigatedmodespin-peierlstransitionactivationalong

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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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Infrared signatures of the spin-Peierls transition in CuGeO3

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