Metal-Insulator Transition in Homogeneously Doped Germanium

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We have measured the electrical conductivity of Ge:Ga samples prepared by neutron-transmutation doping of isotopically enriched 70Ge single crystals in order to study the metal-insulator transition (MIT) ruling out an ambiguity due to inhomogeneous distribution of impurities. The critical exponent for the zero-temperature conductivity is 0.5 in zero magnetic field and 1.1 in magnetic fields. Variable-range-hopping conduction of the insulating samples and finite-temperature scaling analysis of the MIT induced by the external magnetic field are also discussed.
LaTeX2e, 21 pages with 15 embedded figures, to be published in M. F. Thorpe and J. C. Phillips (eds.), "Phase Transitions and Self-Organization in Electronic and Molecular Materials" (Kluwer Academic/Plenum Publishers)

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Disordered Systems and Neural Networks

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http://salesiana.dossiersoluciones.com/handle/123456789/16668

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0008138
 http://arxiv.org/abs/cond-mat/0008138
 In "Phase Transitions and Self-Organization in Electronic and Molecular Materials", edited by J. C. Phillips and M. F. Thorpe (Kluwer Academic/Plenum Publishers, New York, 2001, ISBN 0-306-46568-X) pp. 291--310

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