2013/08/09 by S. M. Gaw, Eric C. Andrade, E. C. Andrade +7
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Atomic physics #Charge (physics) #Cluster (spacecraft) #Condensed matter physics #Frustration #Ground state #Inelastic neutron scattering #Magnetic and transport properties of perovskites and related materials #Magnetic field #Magnetization #Neutron scattering #Optics #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Scattering #Spectral line #Spectrum (functional analysis) #Spin (aerodynamics) #Spin glass #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.88.165121
published as Phys. Rev. B 88 165121 (2013) · 13 pages, 9 figures
arxiv created 2013/08/09 · openalex publication_date 2013/10/14 · arxiv updated 2013/11/15 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report inelastic neutron scattering results that reveal an hour-glass magnetic excitation spectrum in La1.75Sr0.25CoO4. The magnetic spectrum is similar to that observed previously in La1.67Sr0.33CoO4, but the spectral features are broader. We show that the spectrum of La1.75Sr0.25CoO4 can be modelled by the spin dynamics of a system with a disordered cluster spin glass ground state. Bulk magnetization measurements are presented that support the proposed glassy ground state. The observations reiterate the importance of quasi-one-dimensional magnetic correlations and disorder for the hour-glass spectrum, and suggest that disordered spin and charge stripes exist at lower doping in La_2\ensuremath-xSrxCoO4 than previously thought.