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arXiv 1107.1002cond-mat.str-el
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反铁磁体中的隐藏自旋液体:对FeCrAs的应用

Hidden spin liquid in an antiferromagnet: Applications to FeCrAs

Jeffrey G. Rau, Hae-Young Kee

摘要:

最近研究的材料FeCrAs表现出令人惊讶的实验特征的组合,具有金属的费米液体状比热,但电阻率显示出强的非金属特性。Cr亚晶格具有局部磁矩,以堆叠(扭曲)的Kagome晶格的形式。尽管磁阻挫程度很高,但反铁磁有序在~ 125 K以下发展,这表明非磁性Fe亚晶格可能在稳定有序中起作用。从材料性质出发,我们提出了一个包含非磁性Fe亚晶格的低能自由度的微观哈密顿量,并利用从转子平均场论研究了其性质。使用这种方法,我们发现一个自旋液相的Fe亚晶格,即使在磁性Cr亚晶格的存在下生存。最后,我们建议,FeCrAs的功能可以定性地解释在非磁性的亚晶格Fe由于接近金属-绝缘体过渡的临界波动。

英文摘要:

The recently studied material FeCrAs exhibits a surprising combination of experimental signatures, with metallic, Fermi liquid like specific heat but resistivity showing strong non-metallic character. The Cr sublattice posseses local magnetic moments, in the form of stacked (distorted) Kagome lattices. Despite the high degree of magnetic frustration, anti-ferromagnetic order develops below ~125K suggesting the non-magnetic Fe sublattice may play a role in stabilizing the ordering. From the material properties we propose a microscopic Hamiltonian for the low energy degrees of freedom, including the non-magnetic Fe sublattice, and study its properties using slave-rotor mean field theory. Using this approach we find a spin liquid phase on the Fe sublattice, which survives even in the presence of the magnetic Cr sublattice. Finally, we suggest that the features of FeCrAs can be qualitatively explained by critical fluctuations in the non-magnetic sublattice Fe due to proximity to a metal-insulator transition.

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