Magnetic excitation spectrum of highly hole doped layered nickelates
Although charge stripes have been initially discovered in La2-xSrxNiO4 systems and although these findings have triggered a tremendous research activity (documented by the high number of citations), very few is known about the *highly* hole doped La2-xSrxNiO4 materials. Due to the extreme difficulties of sample growth most studies at high hole-doping are only based on polycrystalline powders. Using novel high pressure floating zone furnaces we were able to grow highly hole-doped La2-xSrxNiO4 materials as sizeable single crystals. To study the nature of the magnetic excitations in these highly-hole doped nickelates appears quite interesting since the role of Ni2+ ions and Ni3+ ions is exchanged regarding the magnetic stripe phases occuring in these systems, and, opposite to the case of lower hole doped nickelates around 1/3 doping. Our observation of only transverse magnetic sattelite reflections with unexpected incommensurability values in La1.2Sr0.8NiO4 was quite surprising. Moreover, the low energy magnetic excitations of La1.2Sr0.8NiO4 exhibit a quite steep dispersion. Hence, we propose to measure the entire magnetic excitation spectrum of La1.2Sr0.8NiO4 at the IN8 spectrometer.
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KOMAREK Alexander Christoph; GUO Hanjie; LI Zhiwei; PIOVANO Andrea and SCHMIDT Wolfgang F. (2015). Magnetic excitation spectrum of highly hole doped layered nickelates. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1417
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