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arXiv 1104.3454cond-mat.str-elcond-mat.mtrl-scicond-mat.supr-con
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铁磷属化物和铁硫属化物的动力学阻挫及磁性和顺磁态的性质

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides

Z. P. Yin, K. Haule, G. Kotliar

摘要:

铁的磷属元素化物和硫属元素化物化合物由于其高温超导性而成为深入研究的主题。\cite{a-LaFeAsO}它们都具有相同的结构,但它们的物理性质,如磁有序矩,有效质量,超导能隙和T $_c$有显着的差异。许多理论技术已被应用于个别化合物,但没有一致的描述的趋势是可用的\cite{np-review}。我们进行了大量的铁基化合物在其磁性和顺磁状态的比较理论研究。我们表明,这两种状态的性质是很好地描述了我们的方法和所有的计算的物理性质,如有序矩,有效质量和费米表面的趋势是在整个化合物的实验符合良好。这些性质的变化可以追溯到关键结构参数的变化,而不是库仑相互作用的筛选的变化。我们的结果为\cite{Ding}实验中观察到的强费米面相关超导能隙提供了一个自然的解释。我们提出了一个具体的优化晶体结构,寻找更高的T $_c$超导体。

英文摘要:

The iron pnictide and chalcogenide compounds are a subject of intensive investigations due to their high temperature superconductivity.\cite{a-LaFeAsO} They all share the same structure, but there is significant variation in their physical properties, such as magnetic ordered moments, effective masses, superconducting gaps and T$_c$. Many theoretical techniques have been applied to individual compounds but no consistent description of the trends is available \cite{np-review}. We carry out a comparative theoretical study of a large number of iron-based compounds in both their magnetic and paramagnetic states. We show that the nature of both states is well described by our method and the trends in all the calculated physical properties such as the ordered moments, effective masses and Fermi surfaces are in good agreement with experiments across the compounds. The variation of these properties can be traced to variations in the key structural parameters, rather than changes in the screening of the Coulomb interactions. Our results provide a natural explanation of the strongly Fermi surface dependent superconducting gaps observed in experiments\cite{Ding}. We propose a specific optimization of the crystal structure to look for higher T$_c$ superconductors.

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