Magnetic excitations of Sr2-xLaxFeO4
Sr2FeO4 is a negative charge transfer compound which is isostructural to the high-temperature superconducting (HTSC) cuprates but much less studied so far. This might be owed to the difficulties of crystal growth of this iron oxide with an unusual Fe4+ oxidation state. Powder neutron diffraction studies report the absence of any magnetic reflections. However, the magnetic susceptibility in the same studies exhibits antiferromagnetic properties of this material. We managed to grow sizeable single crystals of Sr2FeO4 and the charge carrier doped compounds Sr2-xLaxFeO4. Therefore, magnetism could be studied much more precisely by means of single crystal neutron diffraction now. Here, we propose to study the magnetic excitation spectra of at least two layered iron oxides including the tetravalent parent compound Sr2FeO4 and a slightly electron doped compound. We expect to uncover the so far fully unknown spectra of these compounds and to compare the resulting spectra of the electron doped compound with the spectra of isostructural layered transition metal oxides that exhibit a so-called “hour-glass” magnetic excitation spectrum.
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KOMAREK Alexander Christoph; DREES Jan Yvo; LI Zhiwei; SCHMIDT Wolfgang F and YANG Junjie. (2013). Magnetic excitations of Sr2-xLaxFeO4. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1243
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