2016/04/27 by Zhiwei Li, Z. W. Li, Y. Drees +23 · 23 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Charge (physics) #Charge ordering #Condensed matter physics #Doping #Magnetic and transport properties of perovskites and related materials #Materials science #Neutron scattering #Paramagnetism #Phase (matter) #Physics #Physics of Superconductivity and Magnetism #Scattering #Spectral line #Spin (aerodynamics) #cond-mat.str-el
paper · pdf · doi:10.1038/srep25117
published in Scientific Reports 6(1), 25117 (Nature Portfolio) · http://www.nature.com/articles/srep25117/
openalex publication_date 2016/04/27 · arxiv created 2016/04/28 · arxiv updated 2016/04/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We observe quasi-static incommensurate magnetic peaks in neutron scattering experiments on layered cobalt oxides La2-xSrxCoO4 with high Co oxidation states that have been reported to be paramagnetic. This enables us to measure the magnetic excitations in this highly hole-doped incommensurate regime and compare our results with those found in the low-doped incommensurate regime that exhibit hourglass magnetic spectra. The hourglass shape of magnetic excitations completely disappears given a high Sr doping. Moreover, broad low-energy excitations are found, which are not centered at the incommensurate magnetic peak positions but around the quarter-integer values that are typically exhibited by excitations in the checkerboard charge ordered phase. Our findings suggest that the strong inter-site exchange interactions in the undoped islands are critical for the emergence of hourglass spectra in the incommensurate magnetic phases of La2-xSrxCoO4.