Systematic study of electron phonon coupling in La2-xSrxNiO4
Recently, a “hour-glass” magnetic excitation spectrum has been found in the cobaltates that resembles on the famous magnetic excitation spectra in the isostructural HTSC cuprates. This discovery has re-attracted enormous interest to the physics of charge stripe phases. Here, we are interested in the electron phonon coupling in charge stripe ordered phases and propose to study the longitudinal bond stretching phonon modes (high-frequency Sigma_1 phonon mode) in La2-xSrxNiO4 (LSNO). So far two conflictive observations have been made in ~1/3 doped and ~0.25 hole-doped LSNO. Hence, the study of other Sr-concentrations seems highly desirable now. We were able to grow stoichiometric 14%-doped LSNO single crystals that exhibit distinctly lower incommensurabilities e (e=0.14 << 0.25) than in the other two hitherto studied LSNO samples and surprisingly also the basic features of a “hour-glass” excitation spectrum. In order to study the effect of electron phonon coupling systematically in LSNO we further propose to measure 40%, 50% and 70% Sr-doped LSNO with substantially different charge ordering propagation vectors. For all these purposes we ask for 5 days at the IN8 spectrometer.
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KOMAREK Alexander Christoph; DREES Jan Yvo; LI Zhiwei; SCHMIDT Wolfgang F; STEFFENS Paul and YANG Junjie. (2013). Systematic study of electron phonon coupling in La2-xSrxNiO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-382
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