Novel Transitions in Doped Mott-Insulator KxCoO2

杨海朋; 鲁希锋; 闻海虎

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Novel Transitions in Doped Mott-Insulator KxCoO2

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By measuring the temperature dependence of the magnetic susceptibility, two distinct transitions have been observed in potassium doped cobalt oxide KxCoO2 (x = 0.2-1.0). The transition around 125 K corresponds to a phase transition between a weak ferromagnetic plus a strong superparamagnetic phase (below 125 K) and a superparamagnetic phase (above 125K). The susceptibility above the Curie point Tc cannot be described by the Curie-Weise law, being consistent with the superparamagnetism. Magnetization-hysteresis-loops have been measured in different temperature regions to uncover the underlying physics. The second transition near 30.8K shows a strong novelty.

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《中国物理快报：英文版》 |2003年第5期|729-730|共2页
作者
杨海朋; 鲁希锋; 闻海虎;
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National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080;

National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080;

National Laboratory for Superconductivity, Institute of Physics and Center for Condensed Matter Physics, Chinese Academy of Sciences, Beijing 100080;

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Novel Transitions in Doped Mott-Insulator KxCoO2

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