Nucara A, Maselli P, Calvani P, Sopracase R, Ortolani M, Gruener G, Guidi M Cestelli, Schade U, García J
CNR-INFM Coherentia and Dipartimento di Fisica, Università di Roma La Sapienza, Piazzale A. Moro 2, I-00185 Roma, Italy.
Phys Rev Lett. 2008 Aug 8;101(6):066407. doi: 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.
在四种具有相称电荷序（CO）的不同锰氧化物的光导率中，在低于有序温度(T_{CO})的毫电子伏特范围内出现了强峰。它们与报道的一维电荷密度波（CDW）的峰相似，并被归因于被钉扎的相子。这些峰及其泛音使得对于(n = 5)、(6)的(La_{1 - n/8}Ca_{n/8}MnO_{3})，能够获得电子 - 声子耦合、CO系统的有效质量及其对介电常数的贡献。这些结果支持了用适度弱耦合和CDW理论来描述La - Ca锰氧化物中的CO。
