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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
materials science
Metal-insulator transition in amorphous Si
1-x
Ni
x
: Evidence for Mott’s minimum metallic conductivity
Physical Review B - Condensed Matter and Materials Physics, Volume 60, No. 20, Year 1999
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Description
We study the metal-insulator transition in two sets of amorphous Si1-xNix films. The sets were prepared by different, electron-beam-evaporation-based technologies: evaporation of the alloy, and gradient deposition from separate Ni and Si crucibles. The characterization included electron and scanning tunneling microscopy, glow discharge optical emission spectroscopy, energy dispersive x-ray analysis, and Rutherford back scattering. Investigating the logarithmic temperature derivative of the conductivity, w = d ln ρ/d ln T, we observe that, for insulating samples, w(T) shows a minimum, increasing at both low and high T. Both the minimum value of w and the corresponding temperature seem to tend to zero as the transition is approached. The analysis of this feature of w(T, x) leads to the conclusion that the transition in Si1-xNix is very likely discontinuous at zero temperature in agreement with Mott’s original views. © 1999 The American Physical Society.
Authors & Co-Authors
Möbius, Arnulf
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Frenzel, C.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Thielsch, R.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Germany, Jena
Fraunhofer-institut Für Angewandte Optik Und Feinmechanik in Jena
Rosenbaum, Ralph L.
Israel, Tel Aviv-yafo
Tel Aviv University
Adkins, C. J.
United Kingdom, Cambridge
Department of Physics
Schreiber, Michael
Germany, Chemnitz
Technische Universität Chemnitz
Bauer, H. D.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Grötzschel, R.
Germany, Dresden
Hzdr - Helmholtz-zentrum Dresden-rossendorf
Hoffmann, V.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Krieg, T.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Matz, N.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Vinzelberg, H.
Germany, Dresden
Leibniz-institut Für Festkörper- Und Werkstoffforschung Dresden
Witcomb, Michael J.
South Africa, Johannesburg
University of the Witwatersrand
Statistics
Citations: 39
Authors: 13
Affiliations: 7
Identifiers
Doi:
10.1103/PhysRevB.60.14209
ISSN:
10980121
e-ISSN:
1550235X
Research Areas
Environmental