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Long-range magnetic order and spin-lattice coupling in delafossite CuFeO_2

机译:铜铁矿CuFeO_2中的长程磁序和自旋-晶格耦合

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摘要

The electronic and magnetic properties of the delafossite CuFeO_2 are investigated by means of electronic structure calculations. They are performed using density functional theory in the generalized gradient approximation, as well as the new full-potential augmented spherical wave method. The calculations reveal three different spin states at the iron sites. Using for the first time the experimentally determined low-temperature crystal structure, we find long-range antiferromagnetic ordering in agreement with experiment. In addition, our calculations show that nonlocal interactions as covered by the generalized gradient approximation lead to a semiconducting ground state.
机译:通过电子结构计算研究了铜铁矿CuFeO_2的电子和磁性。它们是使用密度泛函理论在广义梯度近似中以及新的全势增强球面波方法中执行的。计算结果显示出铁部位的三种不同的自旋态。首次使用实验确定的低温晶体结构,我们发现与实验一致的远距离反铁磁有序。另外,我们的计算表明,广义梯度逼近覆盖的非局部相互作用会导致半导体基态。

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