Heat transport of electron-doped Cobaltates

Abstract

Within the t-J model, the heat transport of electron-doped cobaltates is studied based on the fermion-spin theory. It is shown that the temperature dependent thermal conductivity is characterized by the low temperature peak located at a finite temperature. The thermal conductivity increases monotonously with increasing temperature at low temperatures T $<$ 0.1$J$, and then decreases with increasing temperature for higher temperatures T $>$ 0.1$J$, in qualitative agreement with experimental result observed from Na${}_x$CoO${}_2$ .

4 pages, 1 fig, corrected typos, accepted for publication in Commun. Theor. Phys

References in corpus (5)

• Spin entropy as the likely source of enhanced thermopower in $\rm\bf Na_xCo_2O_4
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• Thermal conductivity in the doped two-leg ladder antiferromagnet Sr${}_{14-x}$Ca${}_x$Cu${}_{24}$O${}_{41}$