TY  - JOUR
AU  - Guo, H.
AU  - Li, Z. W.
AU  - Sakong, S.
AU  - Ryu, G.
AU  - Zhao, L.
AU  - Piovano, A.
AU  - Schmidt, W.
AU  - Sprung, M.
AU  - Strempfer, J.
AU  - Francoual, S.
AU  - Dzhigaev, D.
AU  - Subakti, S.
AU  - Hu, Z.
AU  - Lin, H. J.
AU  - Chen, C. T.
AU  - Luetkens, H.
AU  - Stockert, O.
AU  - Komarek, A. C.
TI  - Suppression of the outwards-dispersing branches in hour-glass magnetic spectra induced by nanoscale phase separation in La 2 − x Sr x CoO 4
JO  - Physical review / B
VL  - 100
IS  - 1
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - FZJ-2019-04872
SP  - 014411
PY  - 2019
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000474877800002
DO  - DOI:10.1103/PhysRevB.100.014411
UR  - https://juser.fz-juelich.de/record/865387
ER  -