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

Hollmann, N.; Haverkort, M. W.; Benomar, M.; Cwik, M.; Braden, M.; Lorenz, T.

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Evidence for a temperature-induced spin-state transition of Co³⁺ in La_2-xSr_xCoO₄

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Haverkort, M. W.
Max Planck Society;

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Citation

Hollmann, N., Haverkort, M. W., Benomar, M., Cwik, M., Braden, M., & Lorenz, T. (2011). Evidence for a temperature-induced spin-state transition of Co³⁺ in La_2-xSr_xCoO₄. Physical Review B, 83(17): 174435.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C029-B

Abstract

We study the magnetic susceptibility of mixed-valent La(2-x)Sr(x)CoO(4) 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 Co(2+) in the high-spin state and by Co(3+) in the nonmagnetic low-spin state. At high temperatures, an increase in susceptibility is seen, which we attribute to a temperature-induced spin-state transition of Co(3+). The susceptibility is analyzed by comparison to full-multiplet calculations for the thermal population of the high- and intermediate-spin states of Co(3+).