Sub-Terahertz Excitations in Manganites with Commensurate Charge Order

Autor:	Ulrich Schade, R. Sopracase, Paola Maselli, J. García, Alessandro Nucara, M. Cestelli Guidi, Michele Ortolani, Gisèle Gruener, Paolo Calvani
Rok vydání:	2008
Předmět:	terahertz Effective mass (solid-state physics) Materials science Condensed matter physics Terahertz radiation collective excitations Quasiparticle Dielectric charge order Condensed Matter Physics Optical conductivity Electronic Optical and Magnetic Materials
Zdroj:	Journal of Superconductivity and Novel Magnetism. 22:13-16
ISSN:	1557-1947 1557-1939
DOI:	10.1007/s10948-008-0366-4
Popis:	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 TCO 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/8Can/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 TCO> 500 K and the coupling is stronger, only the combination bands are clearly detected.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b3654d6073534010979fb0dd68eea9d1 https://doi.org/10.1007/s10948-008-0366-4 Zobrazit plný text záznamu Full text from SpringerLink