Abstract
The IV–VI semiconductor PbTe doped with a small amount of Tl shows superconductivity of T c max ∼ 1.4 K in spite of the small hole carrier densities of p∼10 20 cm −3. The superconducting generating mechanism has received much attention from the viewpoint of carrier resonance scattering with a Tl quasi-localized state. In order to investigate the superconductivity on well-defined film samples, we prepared high-quality Pb(Tl)Te films by the HWE method, and carried out the observation of superconductivity and electrical-transport properties. Furthermore, in the experiment with the coordinated system of Pb(Tl,Na)Te film, the results show for the first time the possible existence of two quasi-localized states of Tl causing strong scattering of carriers accompanied by reduction in Hall mobility μ, which play an important role in the superconductivity of this Pb(Tl)Te system.
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