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Spin-orbit scattering and quantum metallicity in ultrathin Be films Y. M. Xiong, A. B. Karki, D. P. Young, and P. W. Adams
 

Summary: Spin-orbit scattering and quantum metallicity in ultrathin Be films
Y. M. Xiong, A. B. Karki, D. P. Young, and P. W. Adams
Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA
Received 22 December 2008; published 30 January 2009
We compare and contrast the low-temperature magnetotransport properties of ultrathin, insulating Be films
with and without spin-orbit scattering SOS . Beryllium films have very little intrinsic SOS, but by "dusting"
them with submonolayer coverages of Au, one can introduce a well-controlled SOS rate. Pure Be films with
sheet resistance R RQ exhibit a low-temperature negative magnetoresistance MR that saturates to the quan-
tum resistance RQ=h/e2
. This high-field quantum metal phase is believed to represent a different ground state
of the system. In contrast, the corresponding negative MR in Be/Au films is greatly diminished, suggesting
that, in the presence of strong SOS, the quantum metal phase can only be reached at field scales well beyond
those typically available in a low-temperature laboratory.
DOI: 10.1103/PhysRevB.79.020510 PACS number s : 74.78.Db, 72.15.Rn, 73.50. h
Ultrathin metal films have proven to be extraordinarily
fertile systems for studying a variety of quantum scattering
and interaction processes that ultimately serve to destroy the
metallic state of their bulk counterparts.1,2 By the early 1980s
it was recognized that coherent backscattering in moderately
disordered films produces logarithmically insulating behav-

  

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

 

Collections: Materials Science