Pressure dependence of the thermoelectric power of single-walled carbon nanotubes

Details Pressure dependence of the thermoelectric power of single-walled carbon nanotubes Pressure dependence of the thermoelectric power of single-walled carbon nanotubes

2002-03-06

arxiv.org/abs/cond-mat/0203118v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.65.241403

We have measured the thermoelectric power (S) of high purity single-walled carbon nanotube mats as a function of temperature at various hydrostatic pressures up to 2.0 GPa. The thermoelectric power is positive, and it increases in a monotonic way with increasing temperature for all pressures. The low temperature (T < 40 K) linear thermoelectric power is pressure independent and is characteristic for metallic nanotubes. At higher temperatures it is enhanced and though S(T) is linear again above about 100 K it has a nonzero intercept. This enhancement is strongly pressure dependent and is related to the change of the phonon population with hydrostatic pressure.

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