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

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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 Å} Germanium underlayer but not otherwise.
2 pages, 2 eps figures included

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Superconductivity

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http://salesiana.dossiersoluciones.com/handle/123456789/29780

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9910018
 http://arxiv.org/abs/cond-mat/9910018

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arXiv