Misfit和Na钴酸盐中磁性和热电性的相互作用
Interplay between magnetic properties and thermoelectricity in misfit and Na cobaltates
摘要：
我们提出了一个比较研究的CoO 2层的Bi-失配和NaxCoO 2钴酸盐。Co NMR测量Co层的固有磁化率，并且不受虚假贡献的影响。在低掺杂的室温热电势（TEP）是大的，居里-外斯磁化率在两种材料中观察到。但是NMR和muSR实验发现，与NaxCoO 2的情况相反，Bi失配中的电荷和自旋顺序都没有下降到低温。这表明，金属丰度，电荷和磁序是特定的Na层在NaxCoO 2，而强相关性是通用的钴酸盐物理，可以解释大TEP。
英文摘要：
We present a comparative study of CoO2 layers in the Bi-misfit and NaxCoO2 cobaltates. Co NMR measures the intrinsic susceptibility of the Co layers and is not affected by spurious contributions. At low dopings where room-temperature thermopower (TEP) is large, Curie-Weiss susceptibilities are observed in both materials. But NMR and muSR experiments find neither charge nor spin order down to low temperatures in Bi-misfit, in contrast to the case of NaxCoO2. This demonstrates that metallicity, charge and magnetic orders are specific of the Na layers in NaxCoO2 whereas strong correlations are generic of the cobaltates physics and could explain the large TEP.
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