Electrical resistivity, thermal conductivity, and thermopower in theU=∞ Hubbard model

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Abstract
Electrical resistivity, thermal conductivity, and thermopower in the single-band, U=∞, Hubbard model near half-filling are studied by using the retraceable-path approximation originally developed by Brinkman and Rice. We find that the electrical resistivity is proportional to T in the wide temperature range T≳t, where T and t are the temperature and the nearest-neighbor hopping integral, respectively. The thermal conductivity becomes a maximum at T∼t. The thermopower is positive and large at high temperatures, and it has very weak temperature dependence at T≳t. In this context, the Lorenz number decreases with increasing temperature. The magnetoresistance due to orbital motion of holes is also discussed.