Observation of charge-density-wave excitations in manganites

Details Observation of charge-density-wave excitations in manganites Observation of charge-density-wave excitations in manganites

2008-07-16

arxiv.org/abs/0807.2541v1

Phys. Rev. Lett. 101, 066407 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

To be published on Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.066407

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.

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