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 La1-n/8Can/8MnO3 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.
Observation of charge-density-wave excitations in manganites
Nucara A;Maselli P;Calvani P;
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 La1-n/8Can/8MnO3 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.File in questo prodotto:
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