Research work · 2008

Anisotropic Electric Conductivity of Delafossite PdCoO2 Studied by Angle-Resolved Photoemission Spectroscopy

Juris Purans, Nasser Afify, Giuseppe Dalba, R. Grisenti, Andrea Sanson, Paolo Fornasini, S. de Panfilis, A. Kuzmin, V. Ozhogin, Francesco Rocca, S. Tiutiunnikov

CINECA IRIS Institutional Research Information System (IRIS Istituto Nazionale di Ricerca Metrologica)

Abstract

An explicit connection between the electronic structure and the anisotropic high conductivity of delafossite-type PdCoO2 has been established by angle-resolved photoemission spectroscopy (ARPES) and core-level x-ray photoemission spectroscopy. The ARPES spectra show that a large hexagonal electronlike Fermi surface (FS) consists of very dispersive Pd 4d states. The carrier velocity and lifetime are determined from the ARPES data, and the conductivity is calculated by a solution of the Boltzmann equation, which demonstrates that the high anisotropic conductivity originates from the high carrier velocity, the large two-dimensional FS, and the long lifetime of the carriers.

DOI: 10.1103/physrevlett