title: Unusual transport and strongly anisotropic thermopower in PtCoO2 and PdCoO2.
abstract: We show, using Boltzmann transport calculations and analysis of experimental data, that hexagonal PdCoO2 and PtCoO2 have a highly unusual metallic transport. The in-plane transport is typical of a very good metal, with high conductivity and low positive thermopower. The c-axis transport is completely different, with 2 orders of magnitude lower, but still coherent, conductivity and remarkably a very large negative thermopower. This large anisotropy of the thermopower provides an opportunity for investigating transport in a highly unusual regime using bulk materials.
authors.affiliation: Institute of High Performance Computing, 1 Fusionopolis Way, Singapore 138632, Republic of Singapore.
authors.forename: Khuong P
authors.initials: KP
authors.lastname: Ong
authors.forename: David J
authors.initials: DJ
authors.lastname: Singh
authors.forename: Ping
authors.initials: P
authors.lastname: Wu