Sr-doping dependence of possible “hour-glass” magnetic excitations in LSNO
The recent observation of a “hour-glass” magnetic excitation spectrum in La2-xSrxCoO4 resembling on the famous observations in the isostructural HTSC cuprates has re-attracted enormous interest to the physics of charge stripe phases. For the isostructural nickelates no “hour-glass” dispersion was observed so far and even thought to be systematically absent due to a larger inter-stripe exchange coupling J’. However, we were able to observe the basic features of a “hour-glass” excitation spectrum in 14% hole-doped LSNO sample. Now, we would like to extend our studies to slightly higher Sr-doping (i) in order to separate the magnetic signals a little more from the central region for obtaining clearly separated magnon branches and (ii) in order to suppress the octahedral tilting reflection that appears between the magnetic signals (but vanishes for higher Sr-doping). Besides studying the most promising sample in great detail (by mapping the magnetic signals etc.) we would like to study also the Sr-doping dependence and the “nascency” and the vanishing of the “hour-glass” dispersion systematically as a function of Sr-doping by comparing at least three different LSNO samples.
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KOMAREK Alexander Christoph; BETHUNE William; DREES Jan Yvo; LAFUENTE SAMPIETRO Alban; LI Zhiwei; SALAGNAC Thomas; SCHMIDT Wolfgang F; WUNSCHE Anael and YANG Junjie. (2013). Sr-doping dependence of possible “hour-glass” magnetic excitations in LSNO. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1281
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