Abstract
On carefully excluding data affected by ambipolar transport, we find that the behavior of the electrical conductivity σ and thermopower S in TlxTe1x is in accord with a rigid-band model for σ(E) in the range 0.2x0.6. As a result, we are able to determine σ(E) and the dependence of the Fermi energy on x and T. Using the relation σ(E)[N(E)]2, we find that the density of states N(E)E12 for E0.25 eV, and increases less rapidly than this at larger E. Combining this information, we have determined from experimental data the dependence of the hole concentration of T and x within an undetermined constant factor.