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25 April 2024

» arxiv » 0807.2541

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Observation of charge-density-wave excitations in manganites
A. Nucara ; P. Maselli ; P. Calvani ; R. Sopracase ; M. Ortolani ; U. Schade ; G. Gruener ; M. Cestelli Guidi ; J. Garcia ;
Date:	16 Jul 2008
Abstract:	In the optical conductivity of four different manganites with commensurate charge order (CO), strong peaks appear in the meV range below the ordering temperature T_{CO}. They are similar to those reported for one-dimensional charge density waves (CDW) and are assigned to pinned phasons. The peaks and their overtones allow one to obtain, for La{1-n/8}Ca{n/8}$MnO{3} with n = 5, 6, the electron-phonon coupling, the effective mass of the CO system, and its contribution to the dielectric constant. These results support a description of the CO in La-Ca manganites in terms of moderately weak-coupling and of the CDW theory.
Source:	arXiv, 0807.2541
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