Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.066407
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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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