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)=(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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