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

Article

关键词: COBALT OXIDES LA2-XSRXCOO4;    MAGNETIC-PROPERTIES;    PEROVSKITE;    LACOO3;   

DOI  :  10.1103/PhysRevB.83.174435

来源: SCIE

【 摘 要 】

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 nonmagnetic low-spin state. At high temperatures, an increase in susceptibility is seen, which we attribute to a temperature-induced 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+.

【 授权许可】

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