Evidence for a temperature-induced spin-state transition of Co3+ in La2-xSrxCoO4

Abstract

We study the magnetic susceptibility of mixed-valent La2-xSrxCoO4 single crystals in the doping range of 0.5<= x <= 0.8 for temperatures up to 1000 K. The magnetism below room temperature is described by paramagnetic Co2+ in the high-spin state and by Co3+ in the non-magnetic low-spin state. Above room temperature, an increase in susceptibility compared to the behavior expected from Co2+ is seen, which we attribute to a spin-state transition of Co3+. The susceptibility is analyzed by comparison to full-multiplet calculations for the thermal population of the high- and intermediate-spin states of Co3+.

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Cited by in corpus (6)

• The zero-field-cooled exchange bias effect in phase-segregated La${}_{2-x}$A${}_x$CoMnO${}_{6-\delta }$ (A = Ba, Ca, Sr; x = 0, 0.5)
• Neutron scattering studies on stripe phases in non-cuprate materials
• Anomalous magnetic and spin glass behavior in Nb substituted LaCo${}_{1-x}$Nb${}_x$O${}_3$
• Metal-insulator transition in Sr2-xLaxCoO4 driven by spin-state transition
• Magnetic phase diagram of La${}_{2-x}$Sr${}_x$CoO${}_4$ revised using muon-spin relaxation
• Evolution of valence-specific spin states and local distortions in La${}_{2-x}$Sr${}_x$CoO${}_4$