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.

References in corpus (3)

• The spin state transition in LaCoO${}_3$; revising a revision
• Controlling orbital moment and spin orientation in CoO layers by strain
• Determination of the orbital moment and crystal field splitting in LaTiO${}_3$

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