Issue |
Europhys. Lett.
Volume 58, Number 3, May 2002
|
|
---|---|---|
Page(s) | 448 - 454 | |
Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
DOI | https://doi.org/10.1209/epl/i2002-00659-y | |
Published online | 01 August 2002 |
Zero-bias anomaly in
junctions
Center for Materials Research and Analysis and
Department of Physics and Astronomy
Behlen Laboratory of Physics,
University of Nebraska - Lincoln, NE 68588-0111, USA
Received:
12
October
2001
Accepted:
5
February
2002
thin films, with crystallites of several microns size,
provide the opportunity for the investigation of the intergrain
tunneling between a few crystals separated by a 1–2
thick
film. A pronounced zero-bias anomaly of the
conductance is found at low temperatures. Combined photoemission
and inverse photoemission temperature-dependent studies confirm the
occurrence of Coulomb blockade. For the strong-tunneling case (
), the magnetoresistance decreases strongly
with bias. For the weak-tunneling case (
), the
magnetoresistance decreases by a factor two with increasing bias,
as predicted by a co-tunneling model.
PACS: 75.70.-i – Magnetic properties of thin films, surfaces, and interfaces / 81.15.Gh – Chemical vapor deposition (including plasma-enhanced CVD, MOCVD, etc.) / 82.30.Lp – Decomposition reactions (pyrolysis, dissociation, and fragmentation)
© EDP Sciences, 2002
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