Tenfold Magnetoconductance in a Non-Magnetic Metal Film
V. Yu. Butko, J. F. DiTusa, P. W. Adams
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)=(2e2/h)-(To/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 field enhanced variable range hopping characterized by an attenuation of To via the Zeeman interaction.
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