Contributions of impurity band and electron-electron interactions to magnetoconductance in AlGaN

Date
2010-06-30
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Source Title
Philosophical Magazine
Print ISSN
1478-6435
Electronic ISSN
1478-6443
Publisher
Taylor & Francis
Volume
90
Issue
26
Pages
3591 - 3599
Language
English
Type
Article
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Abstract

Low temperature electrical measurements of conductivity, the Hall effect and magnetoconductance were performed on a degenerate AlGaN sample. The sample exhibited negative magnetoconductance at low magnetic fields and low temperatures, with the magnitude being systematically dependent on temperature. The measured magnetoconductance was compared with models proposed previously by Sondheimer and Wilson [Proc. R. Soc. Lond. Ser. A 190 (1947) p. 435] and Lee and Ramakrishan [Rev. Mod. Phys. 57 (1985) p. 287]. Data were analyzed as the sum of the contribution of a two-band and electron-electron interactions to the magnetoconductance, applying these models to describe the observed behavior. Least-squares fits to the data are presented. In the sample, magnetoconductance can be explained reasonably well by assuming these contributions to the measured magnetoconductance. It was found that theoretical and experimental data were in excellent agreement.

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Keywords
AlGaN, Electron-electron interactions, Impurity band, MOCVD, Negative magnetoconductance, Two-band model
Citation
Published Version (Please cite this version)