Unconventional magneto-transport in ultrapure PdCoO2 and PtCoO2
Unconventional magneto-transport in ultrapure PdCoO2 and PtCoO2
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DOI：
10.1038/s41535-018-0138-8
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发表时间：
2018-12-18
影响因子：
5.7
通讯作者：
Mackenzie, Andrew P.
中科院分区：
文献类型：
--
作者：
Nandi, Nabhanila;Scaffidi, Thomas;Mackenzie, Andrew P.
单带，准二维金属PdCoO2和PtCoO2最近已经变得突出，因为它们的极长的平均自由程，这使它们成为已知的一些最电子纯的材料，并作为以前不可观察的电子输运机制的潜在宿主。为了充分建立它们的磁输运性质，我们研究了大块单晶体的磁阻和霍尔效应，这些单晶体的电接触已经使用聚焦离子束加工以高精度制成。我们观察到一个很强的温度依赖性的霍尔电阻率在小的应用领域，链接到一个大的违反科勒规则的磁阻。我们将讨论在何种程度上这些意见可以占标准运输理论。
The single-band, quasi-two dimensional metals PdCoO2 and PtCoO2 have recently come to prominence because of their extremely long mean free paths, which establish them as some of the most electronically pure materials known, and as potential hosts of previously unobservable regimes of electronic transport. To fully establish their magnetotransport properties, we have studied the magnetoresistance and Hall effect in bulk single crystals to which electrical contacts have been made with high precision using focused ion beam machining. We observe a strong temperature dependence of the Hall resistivity in small applied fields, linked to a large violation of Kohler's rule in the magnetoresistance. We discuss the extent to which these observations can be accounted for by standard transport theory.