Title: Two-channel Kondo effects in Al/AlO(x)/Sc planar tunnel junctions
Authors: Yeh, Sheng-Shiuan
Lin, Juhn-Jong
Department of Electrophysics
Institute of Physics
Issue Date: 1-Jan-2009
Abstract: We have measured the differential conductances G(V, T) in several Al/AlO(x)/Sc planar tunnel junctions between 2 and 35 K. As the temperature decreases to similar to 16 K, the zero-bias conductance G(0, T) crosses over from a standard -ln T dependence to a novel -root T dependence. Correspondingly, the finite bias conductance G(V, T) reveals a two-channel Kondo scaling behavior between similar to 4 and 16 K. The observed two-channel Kondo physics is ascribed to originating from a few localized spin-1/2 Sc atoms situated slightly inside the AlO(x)/Sc interface.
URI: http://dx.doi.org/10.1103/PhysRevB.79.012411
ISSN: 1098-0121
DOI: 10.1103/PhysRevB.79.012411
Volume: 79
Issue: 1
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