Magnetoresistance and conductivity exponents of quench-condensed ultra-thin films of Bi

Details Magnetoresistance and conductivity exponents of quench-condensed ultra-thin films of Bi Magnetoresistance and conductivity exponents of quench-condensed ultra-thin films of Bi

1999-10-02

arxiv.org/abs/cond-mat/9910018v1

Physics

Condensed Matter

Superconductivity

2 pages, 2 eps figures included

Scientific paper

We have studied the magnetoresistance (MR) and evolution of conductivity with thickness of quench-condensed Bismuth films on substrates of various dielectric constants. Our results indicate a negative intial MR proportional to the square of the magnetic field. The conductance shows a power-law kind of dependence on thickness, with an exponent close to 1.33, characterisitic of a 2-D percolating system, only when the films are grown on a thin ($\sim 10${\rm \AA} Germanium underlayer but not otherwise.

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