Abstract
AbstractWe present measurements of the electrical conductivity of barely metallic n‐type indium phosphide (InP) that are driven to the metal‐insulator transition (MIT) by a magnetic field. The experiments are carried out at low temperature in the range 4.2−0.066 K and in magnetic fields up to 11 T. The analysis of the low‐temperature correction to the Boltzmann conductivity due to electron–electron interaction as a function of the magnetic field allowed us to study the influence of exchange and Hartree interactions on the change of the sign of the electron–electron interaction correction. When the magnetic field is increased, several phenomena contribute to this corrective term “mT1/2” among which are the spin‐splitting effect, the electron–electron interaction effect, and weak localisation effect. Not too close to the MIT, both the inelastic diffusion length LI and the interaction length LT contribute to a T1/2 corrective term of the metallic electrical conductivity σ. It is convenient to develop a criterion to distinguish their contribution. This is based on the relation between the magnitude m and the zero temperature σ (T = 0). (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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