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VOLUME 85, NUMBER 1 P H Y S I C A L R E V I E W L E T T E R S 3 JULY 2000 Tenfold Magnetoconductance in a Nonmagnetic Metal Film
 

Summary: VOLUME 85, NUMBER 1 P H Y S I C A L R E V I E W L E T T E R S 3 JULY 2000
Tenfold Magnetoconductance in a Nonmagnetic Metal Film
V. Yu. Butko,* J. F. DiTusa, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70806
(Received 9 November 1999)
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 exp 2 T0 T 1 2
. The low field MC of the films is negative with G decreasing a factor of
2 below 1 T. In contrast the MC above 1 T is strongly positive. At 8 T, G increases tenfold in
perpendicular field and fivefold in parallel field. In the simpler parallel case, we observe field enhanced
variable range hopping characterized by an attenuation of T0 via the Zeeman interaction.
PACS numbers: 72.20.Ee, 71.30.+h, 73.50.h
Over the last two decades a large and diverse research ef-
fort has grown around nanostructures and low dimensional
systems. Not only has this area of investigation allowed
the exploration of fundamental quantum phenomena, but
it also promises to impact magnetic storage technology
and magnetoelectronics. In particular, the development of

  

Source: Adams, Philip W. - Department of Physics and Astronomy, Louisiana State University

 

Collections: Materials Science