A shift of the mobility edge at weak magnetic fields

Autor:	R. Rosenbaum, E. Tousson, Zvi Ovadyahu, V. Volterra, E. P. Rubenstein
Rok vydání:	1987
Předmět:	Physics Range (particle radiation) Condensed matter physics Hall effect General Chemical Engineering Quantum mechanics Coulomb General Physics and Astronomy Edge (geometry) Critical value Constant (mathematics) Value (mathematics) Magnetic field
Zdroj:	Philosophical Magazine B. 56:875-880
ISSN:	1463-6417 1364-2812
DOI:	10.1080/13642818708215322
Popis:	We report on magnetoconductivity measurements performed on In2O3−x samples near the Anderson transition. The presence of Coulomb correlations severely limits the range of temperatures and fields over which one can meaningfully compare data with theory. By restricting the analysis to data taken at low fields (where the Hall coefficient is constant), the accuracy of the extrapolated value of σ(0) is somewhat compromised. Nevertheless, it is shown that Δσ (0,H) ∼Ce2/h;l2 with C∼0·045 ± 0·02 in agreement with the theoretical arguments due to Mott and Kaveh (1985) and Shapiro (1984). This value of C is essentially independent of the disorder up to ∼10% of the critical value. Thus, our results imply that, at weak fields, the critical index does not differ from its zero-field value.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::21cf9545878e6ed84c87d734ede7b737 https://doi.org/10.1080/13642818708215322 Zobrazit plný text záznamu