The delafossite series of layered oxides includes some of the highest conductivity metals ever discovered. Of these,

{PtCoO}_{2}

, with a room-temperature resistivity of 1.8

μ Ω 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

{PtCoO}_{2}

, at temperatures down to 35 mK and magnetic fields up to 30 T. As for

{PdCoO}_{2}

and

{PdRhO}_{2}

, 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

{PtCoO}_{2}

Publications with shared reference:

0 publications found