Disorder, cluster spin glass, and hour-glass spectra in striped magnetic insulators

Abstract

Hour-glass-shaped magnetic excitation spectra have been detected in a variety of doped transition-metal oxides with stripe-like charge order. Compared to the predictions of spin-wave theory, these spectra display a different intensity distribution and anomalous broadening. Here we show, based on a comprehensive modelling of these phenomena for La5/3Sr1/3CoO4, how quenched disorder in the charge sector causes frustration, and consequently cluster-glass behavior at low temperatures, in the spin sector. This spin-glass physics, which is insensitive to the detailed nature of the charge disorder, but sensitive to the relative strength of the magnetic inter-stripe coupling, ultimately determines the distribution of magnetic spectral weight and thus causes the hour-glass spectrum.

arXiv comment5 pages, 4 figures. Supplemental Material: 8 pages, 10 figures. Explicit comparison to experimental results in La5/3Sr1/3CoO4 included

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Cited by in corpus (13)

• Hour-glass magnetic excitations induced by nanoscopic phase separation in cobalt oxides La${}_{2-x}$Sr${}_x$CoO${}_4$
• Influence of long-range interactions on charge ordering phenomena on a square lattice
• Direct evidence for charge stripes in a layered cobalt oxide
• Hour-glass magnetic spectrum in a stripe-less insulating transition metal oxide
• Incommensurate spin correlations in highly oxidized cobaltates La${}_{2-x}$Sr${}_x$CoO${}_4$
• Diversity of charge orderings in correlated systems
• Stripe disorder and dynamics in the hole-doped antiferromagnetic insulator La5/3Sr1/3CoO4
• Dynamics of Phase Separated States in the Double Exchange Model
• Energy-dependent crossover from anisotropic to isotropic magnetic dispersion in lightly-doped La1.96Sr0.04CuO4
• The Hour-Glass Magnetic Spectrum Arising from a Striped, Cluster Spin Glass Ground State in La1.75Sr0.25CoO4
• Study of long-range orders of hard-core bosons coupled to cooperative normal modes in two-dimensional lattices
• Spin excitation spectrum of high-temperature cuprate superconductors from finite cluster simulations
• Quantum Spin Liquids Stabilized by Disorder in Non-Kramers Pyrochlores