Abstract
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.
Highlights
Recent years have seen a rapid growth of research on unusual regimes of electronic transport.[1]
As described in the Methods section below, the extremely high conductivity of PdCoO2 and PtCoO2 means that devices with precisely defined geometries are required for accurate measurements; this was achieved by sculpting single crystals using focused ion beams
3 devices of this kind were made from PdCoO2 and 3 from PtCoO2 for this project; representative devices of each material are shown in Fig. 2a and b, respectively, with measured zero-field resistivity shown in Fig. 2c and d
Summary
Recent years have seen a rapid growth of research on unusual regimes of electronic transport.[1] Of particular interest is one in which the mean free path deduced from standard measurements of electrical resistivity is very long. The majority of the bulk metals with extremely long mean free paths are either low carrier density semi-metals or materials with fairly complex multi-sheet Fermi surfaces and both electron- and hole-like carriers. It is highly desirable, to identify high carrier density metals with simple, single-sheet Fermi surfaces and long resistive mean free paths, to provide benchmark systems for understanding electrical transport. An additional benefit is quasitwo-dimensional conduction, to provide information at high carrier density to complement observations in the low density two dimensional systems
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