%0 Journal Article
%A Guo, H.
%A Li, Z. W.
%A Sakong, S.
%A Ryu, G.
%A Zhao, L.
%A Piovano, A.
%A Schmidt, W.
%A Sprung, M.
%A Strempfer, J.
%A Francoual, S.
%A Dzhigaev, D.
%A Subakti, S.
%A Hu, Z.
%A Lin, H. J.
%A Chen, C. T.
%A Luetkens, H.
%A Stockert, O.
%A Komarek, A. C.
%T Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in La 2 − x Sr x CoO 4
%J Physical review / B
%V 100
%N 1
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M FZJ-2019-04872
%P 014411
%D 2019
%X Here, we reinvestigate the underlying charge and magnetic correlations in La2−xSrxCoO4 within a combined study of muon spin relaxation (μSR), x-ray photon correlation spectroscopy, synchrotron radiation single-crystal x-ray diffraction, and neutron-scattering measurements. For La2−xSrxCoO4 around 1/3 hole-doping, the significant charge correlations that are responsible for the emergence of hour-glass magnetic spectra are found to be slowly fluctuating checkerboard charge ordering (CBCO) correlations with an onset temperature being independent of hole-doping. This reveals a local origin of the CBCO correlations in the rather ionic cobaltates, thus being distinct from the more covalent nickelates. Moreover, we report the observation of a very similar temperature dependence of the intensities of in-plane high- and low-energy excitations within the La2−xSrxCoO4 hour-glass spectrum. This observation shows that nano phase separation is distinct from conventional phase separation and that there is a coupling between nanometer-sized undoped and hole-doped islands. Based on this, it is possible to propose a microscopic scenario for the suppression of the outwards-dispersing branches in hour-glass magnetic spectra.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000474877800002
%R 10.1103/PhysRevB.100.014411
%U https://juser.fz-juelich.de/record/865387