Unusual transport and highly anisotropic thermopower in PtCoO2 and PdCoO2

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.104.176601· OSTI ID:981432

Ong, Khuong P ^[1]; Singh, David J ^[2]; Wu, Ping ^[1]

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1. IHPC, Singapore
2. ORNL

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 981432
• Journal Information: Physical Review Letters, Vol. 104, Issue 17; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
EXPERIMENTAL DATA
MATERIALS
ORDERS
TRANSPORT