Abstract
The optical conductivity of La–Ca, Nd–Sr, and Bi–Sr manganites with commensurate charge order (CO) has been first observed in the sub-THz region. Below, the ordering temperature T CO well-defined peaks are observed, associated with side bands. They are assigned to pinned phasons, and to combinations of phasons and amplitudons, respectively. In La1−n/8Ca n/8MnO3 with n=5, 6, one can thus determine the electron-phonon coupling, the effective mass of the CO system, and its contribution to the dielectric constant. Their values support a description of the CO in La–Ca manganites in terms of a CDW approach. In Bi0.5Sr0.5MnO3, where T CO> 500 K and the coupling is stronger, only the combination bands are clearly detected.
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Nucara, A., Maselli, P., Calvani, P. et al. Sub-Terahertz Excitations in Manganites with Commensurate Charge Order. J Supercond Nov Magn 22, 13–16 (2009). https://doi.org/10.1007/s10948-008-0366-4
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DOI: https://doi.org/10.1007/s10948-008-0366-4