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- W2023479076 abstract "Electrical property evolution of Bi2AE2Co2O8+δ single crystals (AE = Ca, Sr and Ba) is systematically explored. When AE changes from Ca to Ba, the electrical property of Bi2Ca2Co2O8+δ and Bi2Sr2Co2O8+δ demonstrates semiconductor-like properties. But Bi2Ba2Co2O8+δ shows the metallic behavior. Analysis of temperature-dependent resistance substantiates that from metallic Bi2Ba2Co2O8+δ to semiconductor-like Bi2Sr2Co2O8+δ can be attributed to Anderson localization. However the semiconductor behaviour of Bi2Sr2Co2O8+δ and Bi2Ca2Co2O8+δ is related to electronic correlations effect that is inferred by large negative magnetoresistance (∼70%). The theoretical electronic structures and valence X-ray photoemission spectroscopy substantiate that there is a relative large density of state around Fermi level in Bi2Ba2Co2O8+δ compared with other two compounds. It suggests that Bi2Ba2Co2O8+δ is more apt to be metal in this material system." @default.
- W2023479076 created "2016-06-24" @default.
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- W2023479076 date "2014-07-28" @default.
- W2023479076 modified "2023-09-25" @default.
- W2023479076 title "Metal-semiconductor-transition observed in Bi<sub>2</sub>Ca(Sr, Ba)<sub>2</sub>Co<sub>2</sub>O<sub>8+δ</sub> single crystals" @default.
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- W2023479076 doi "https://doi.org/10.1063/1.4891845" @default.
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