"Sliding charge-density-wave in two-dimensional rare-earth tellurides"
Prof. Pierre Monceau

応用物理学部門学術講演会、杉野目記念会海外学識者講演会、第188回エ ンレイソウの会共催
講演題目：　Sliding charge-density-wave in two-dimensional rare-earth tellurides
講　師　：　Prof. Pierre Monceau
　　　　　Institut Neel, CNRS and University Joseph Fourier, France
日　時　：　平成25年3月21日（木） 15:00-16:30
場　所　：　北海道大学 工学部大会議室(A1-17)

要　旨　：
Amplitude charge density wave (CDW) excitations in rare earth tritellurides (RTe3) were probed by Raman scattering and femtosecond pump-probe spectroscopy. However, collective charge phase excitations could not be observed in far-infrared measurements due to screening by the residual metallic component at the Fermi surface. But the phase collective mode is accessible through nonlinear transport properties. We report such nonlinear transport properties in the layered DyTe3 at temperatures below the CDW phase transition, TP = 302K. Conductivity is increasing sharply above a threshold field. Under application of a rf field Shapiro steps are clearly observed. These features demonstrate for the first time CDW sliding in two-dimensional compounds. In collaboration with A. A. Sinchenko (Kotel’nikov Institut, Moscow) and P. Lejay (Institut Neel, Grenoble).

世話人　 丹田　聡
(tanda@eng.hokudai.ac.jp)
北海道大学大学院工学研究院応用物理学部門

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