Anisotropic Susceptibility of La_2-xSr_xCoO_4 related to the Spin States of Cobalt

Abstract

We present a study of the magnetic susceptibility of La_2-xSr_xCoO_4 single crystals in a doping range 0.3<=x<=0.8. Our data shows a pronounced magnetic anisotropy for all compounds. This anisotropy is in agreement with a low-spin ground state (S=0) of Co^3+ for x>=0.4 and a high-spin ground state (S=3/2) of Co^2+. We compare our data with a crystal-field model calculation assuming local moments and find a good description of the magnetic behavior for x>=0.5. This includes the pronounced kinks observed in the inverse magnetic susceptibility, which result from the anisotropy and low-energy excited states of Co^2+ and are not related to magnetic ordering or temperature-dependent spin-state transitions.

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• Neutron scattering studies on stripe phases in non-cuprate materials
• Magnetic order and dynamics of the charge-ordered antiferromagnet La1.5Sr0.5CoO4
• Direct evidence for charge stripes in a layered cobalt oxide
• Magnetic spectrum of the two-dimensional antiferromagnet La2CoO4 studied by inelastic neutron scattering
• Anomalous magnetic and spin glass behavior in Nb substituted LaCo${}_{1-x}$Nb${}_x$O${}_3$
• Evidence for a temperature-induced spin-state transition of Co3+ in La2-xSrxCoO4
• Metal-insulator transition in Sr2-xLaxCoO4 driven by spin-state transition
• Substitution effects on the temperature vs. magnetic-field phase diagrams of the quasi-1D effective Ising spin-1/2 chain system BaCo${}_2$V${}_2$O${}_8$
• Disorder, cluster spin glass, and hour-glass spectra in striped magnetic insulators
• The spin states of Co ions in La1.5Ca0.5CoO4 from first-principles
• The Hour-Glass Magnetic Spectrum Arising from a Striped, Cluster Spin Glass Ground State in La1.75Sr0.25CoO4
• Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation
• Magnetic correlations in subsystems of the misfit [Ca${}_2$CoO${}_3$]${}_{0.62}$[CoO${}_2$] cobaltate
• Study of long-range orders of hard-core bosons coupled to cooperative normal modes in two-dimensional lattices
• Evolution of valence-specific spin states and local distortions in La${}_{2-x}$Sr${}_x$CoO${}_4$
• Random magnetic anisotropy driven transitions in layered perovskite LaSrCoO${}_4$