Tenfold Magnetoconductance in a Non-Magnetic Metal Film

Abstract

We present magnetoconductance (MC) measurements of homogeneously disordered Be films whose zero field sheet conductance (G) is described by the Efros-Shklovskii hopping law $G(T)=(2e^2/h)\exp -(T_o/T{)}^{1/2}$. The low field MC of the films is negative with G decreasing 200% below 1 T. In contrast the MC above 1 T is strongly positive. At 8 T, G increases 1000% in perpendicular field and 500% in parallel field. In the simpler parallel case, we observe {\em field enhanced} variable range hopping characterized by an attenuation of $T_o$ via the Zeeman interaction.

9 pages including 5 figures

References in corpus (4)

• Coulomb Gap: How a Metal Film Becomes an Insulator
• Metal-Insulator Transition of Disordered Interacting Electrons
• Statistics of energy spectra of a strongly disordered system of interacting electrons
• Coulomb Gap in the Density of States of Disordered Metals in Two Dimensions

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• Exchange Field-Mediated Magnetoresistance in the Correlated Insulator Phase of Be Films