Observation of charge-density-wave excitations in manganites

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Authors
Nucara, A.
Maselli, P.
Calvani, P.
Sopracase, R.
Ortolani, M.
Schade, U.
Gruener, G.
Guidi, M. Cestelli
Garcia, J.
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Abstract
Description
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.
Comment: To be published on Phys. Rev. Lett
Keywords
Condensed Matter - Strongly Correlated Electrons, Condensed Matter - Materials Science
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