Superconductivity and transport properties of narrow-gap semiconductor Pb(Tl)Te film by HWE growth
✍ Scribed by Hironaru Murakami; Wataru Hattori; Ryozo Aoki
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 595 KB
- Volume
- 269
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
The IV-VI semiconductor PbTe doped with a small amount of T1 shows superconductivity of Tc max'~1.4 K in spite of the Small hole carrier densities of p,-,10 ~ cm -3. The superconducting generating mechanism has received much attention from the viewpoint of carder resonance scattering with a TI quasi-localized state. In order to investigate the superconductivity on well-defined film samples, we prepared high-quality Pb(T1)Te films by the HWE method, and carded out the observation of superconductivity and electrical-transport properties. Furthermore, in the experiment with the coordinated system of Pb(TI,Na)Te film, the results show for the first time the possible existence of two quasi-localized states of TI causing strong scattering of carders accompanied by reduction in Hall mobility /z, which play an important role in the superconductivity of this Pb(T1)Te system.