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

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

2008-01-14

arxiv.org/abs/0801.2087v1

New J. of Phys. 10, 023018 (2008)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1088/1367-2630/10/2/023018

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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