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arXiv 0801.4077cond-mat.mtrl-scicond-mat.str-el
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铜铁矿PdCoO2和PtCoO2的金属导电性

On the metallic conductivity of the delafossites PdCoO2 and PtCoO2

Volker Eyert, Raymond Fresard, Antoine Maignan

摘要:

通过电子结构计算研究了PdCoO_2和PtCoO_2准二维行为的起源。它们是使用密度泛函理论在广义梯度近似以及新的全势增广球面波方法。我们表明,电导率进行几乎完全由平面内的Pd(Pt)d轨道。相反,八面体配位的Co原子的绝缘CoO2夹层可以被视为载流子库。这导致Pd(Pt)层的弱电子耦合。所得到的近圆柱形费米面导致电导率的强各向异性。

英文摘要:

The origin of the quasi two-dimensional behavior of PdCoO2 and PtCoO2 is 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. We show that the electric conductivity is carried almost exclusively by the in-plane Pd (Pt) d orbitals. In contrast, the insulating CoO2 sandwich layers of octahedrally coordinated Co atoms may be regarded as charge carrier reservoirs. This leads to a weak electronic coupling of the Pd (Pt) layers. The obtained nearly cylindrical Fermi surface causes the strong anisotropy of the electric conductivity.

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