Institute of High Performance Computing, 1 Fusionopolis Way, Singapore 138632, Republic of Singapore.
Phys Rev Lett. 2010 Apr 30;104(17):176601. doi: 10.1103/PhysRevLett.104.176601. Epub 2010 Apr 28.
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.
我们通过玻尔兹曼输运计算和实验数据分析表明，六方晶相的 PdCoO2 和 PtCoO2 具有非常不寻常的金属输运性质。面内输运行为与非常好的金属类似，具有高电导率和低正热功率。而 c 轴输运则完全不同，电导率低 2 个数量级，但仍具有相干性，并且热功率非常大，呈显著的负电性。这种大的热功率各向异性为使用块状材料研究非常不寻常的输运状态提供了机会。
