Magnetic Properties of Doped Semiconductors
- 1 January 1986
- journal article
- Published by IOP Publishing in Physica Scripta
- Vol. T14, 7-16
- https://doi.org/10.1088/0031-8949/1986/t14/002
Abstract
Doped semiconductors, being a physical realization of an ensemble of one-electron (hydrogenic) atoms distributed randomly in space, are in a sense the simplest disordered system. Our current understanding of their magnetic properties is reviewed, for densities on both sides of a critical density nc at which the system undergoes a transition (at zero temperature) from an insulating phase (n < nc) to a metallic phase (n > nc). It is argued that the insulating phase is well modeled in terms of a disordered Heisenberg antiferromagnet, and quantitative agreement with experiment can be obtained. In contrast, the metallic phase just beyond nc, is not as well understood, and a number of possible candidate models are described. Finally, the issue of the effect of magnetic properties on the metal-insulator transition is addressed.Keywords
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