Electronic transport properties of Pb(Bi1−xSbx)2(Te1−ySey)4 topological insulator

A series of Pb(Bi1−xSbx)2(Te1−ySey)4 topological insulator crystals with various Sb molar ratios x and Se molar ratios y were fabricated, and their electronic transport properties were studied. Some of the millimeter-sized samples exhibited metallic behavior, while others exhibited semiconducting be...

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Veröffentlicht in:Journal of applied physics 2022-05, Vol.131 (18)
Hauptverfasser: Tokumoto, Yuki, Sugimoto, Kyoichi, Hattori, Yuya, Edagawa, Keiichi
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Sprache:eng
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Zusammenfassung:A series of Pb(Bi1−xSbx)2(Te1−ySey)4 topological insulator crystals with various Sb molar ratios x and Se molar ratios y were fabricated, and their electronic transport properties were studied. Some of the millimeter-sized samples exhibited metallic behavior, while others exhibited semiconducting behavior with a resistivity as high as 48 mΩ cm at 2 K. In addition, Hall coefficients with a large variance were observed for samples from the same ingot, indicating spatial fluctuations in the composition and/or a nonuniform defect distribution. Then, micrometer-sized samples were cut from the millimeter-sized sample with the highest resistivity, and further electrical transport measurements were performed. Some of the micrometer-sized samples exhibited an even higher resistivity than that for the millimeter-sized sample. The magnetoresistance of the semiconducting micrometer-sized samples agreed well with a three-dimensional weak antilocalization/weak localization model in the low-temperature region below 20 K.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0077002