Metal-insulator transition and superconductivity in Sr- and La-substituted BaPb1-xBixO3

A. Yamamoto; T. Furumochi; S. Tajima

doi:10.1016/S0921-4534(99)00539-0

Metal-insulator transition and superconductivity in Sr- and La-substituted BaPb_1-xBi_xO₃

A. Yamamoto, T. Furumochi, S. Tajima

Global course of Engineering and Science

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

Compositional boundaries of the metal-insulator transition (MIT) in Sr- and La-substituted BaPb_1-xBi_xO₃ (BPBO) were determined by dc susceptibility, electrical resistivity and thermoelectric power (TEP) measurements. By the 20% substitution of Sr for Ba, a Bi compositional range for metallic (superconducting) phase considerably extended to the Bi-rich region (x≈0.5), though BPBO exhibited metal (superconductivity) only below x = 0.3. On the other hand, by the 10% La substitution, a Bi range for metal (superconductivity) slightly decreased to the Bi-poor region (x≈0.25). Transport properties indicated that the MIT takes place at the lattice parameter a_p≈4.29 angstroms, irrespective of the substitution elements. This suggests that the cell size determining the Bi-O orbital overlap and/or a magnitude of the band split, is one of the essential factors of the MIT in BPBO.

Original language	English
Pages (from-to)	118-124
Number of pages	7
Journal	Physica C: Superconductivity and its applications
Volume	328
Issue number	1
DOIs	https://doi.org/10.1016/S0921-4534(99)00539-0
Publication status	Published - 1999 Dec 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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Yamamoto, A., Furumochi, T., & Tajima, S. (1999). Metal-insulator transition and superconductivity in Sr- and La-substituted BaPb_1-xBi_xO₃. Physica C: Superconductivity and its applications, 328(1), 118-124. https://doi.org/10.1016/S0921-4534(99)00539-0

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abstract = "Compositional boundaries of the metal-insulator transition (MIT) in Sr- and La-substituted BaPb1-xBixO3 (BPBO) were determined by dc susceptibility, electrical resistivity and thermoelectric power (TEP) measurements. By the 20% substitution of Sr for Ba, a Bi compositional range for metallic (superconducting) phase considerably extended to the Bi-rich region (x≈0.5), though BPBO exhibited metal (superconductivity) only below x = 0.3. On the other hand, by the 10% La substitution, a Bi range for metal (superconductivity) slightly decreased to the Bi-poor region (x≈0.25). Transport properties indicated that the MIT takes place at the lattice parameter ap≈4.29 angstroms, irrespective of the substitution elements. This suggests that the cell size determining the Bi-O orbital overlap and/or a magnitude of the band split, is one of the essential factors of the MIT in BPBO.",

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