Fermi surface of PtCoO2 from quantum oscillations and electronic structure calculations
Fermi surface of PtCoO2 from quantum oscillations and electronic structure calculations
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DOI：
10.1103/physrevb.101.195101
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发表时间：
2020-05-01
影响因子：
3.7
通讯作者：
Hassinger, E.
中科院分区：
文献类型：
--
作者：
Arnold, F.;Naumann, M.;Hassinger, E.
delafote系列的层状氧化物包括一些迄今发现的导电性最高的金属。其中，PtCoO2在平面内传输时的室温电阻率为1.8 μ ω cm，是导电性能最好的材料。高导电性发生在三角形晶格Pt层中，由Co-O八面体层隔开，电子结构由两种层的相互作用决定。我们详细研究了PtCoO2在温度低至35 mK，磁场高达30 t时的量子振荡。对于PdCoO2和PdRhO2，费米表面由一个主要具有Pt特征的圆柱体组成，有效质量接近自由电子值。由于费米曲面翘曲，观测到两个靠近的高频。此外，出现明显的频率差异。通过详细分析量子振荡频率的角依赖性，建立了费米曲面的翘曲参数。我们将这些结果与第一性原理电子结构计算的预测结果（包括Pt和Co上的自旋轨道耦合和Co上的现场相关U）进行了比较，从而证明Co- o层中的电子相关在决定PtCoO2电子结构的特征特征方面起着重要作用。
The delafossite series of layered oxides includes some of the highest conductivity metals ever discovered. Of these, PtCoO2, with a room-temperature resistivity of 1.8 mu Omega cm for in-plane transport, is the most conducting of all. The high conduction takes place in triangular lattice Pt layers, separated by layers of Co-O octahedra, and the electronic structure is determined by the interplay of the two types of layers. We present a detailed study of quantum oscillations in PtCoO2, at temperatures down to 35 mK and magnetic fields up to 30 T. As for PdCoO2 and PdRhO2, the Fermi surface consists of a single cylinder with mainly Pt character and an effective mass close to the free-electron value. Due to Fermi-surface warping, two close-lying high frequencies are observed. Additionally, a pronounced difference frequency appears. By analyzing the detailed angular dependence of the quantum-oscillation frequencies, we establish the warping parameters of the Fermi surface. We compare these results to the predictions of first-principles electronic-structure calculations including spin-orbit coupling on Pt and Co and on-site correlation U on Co, and hence demonstrate that electronic correlations in the Co-O layers play an important role in determining characteristic features of the electronic structure of PtCoO2.