Current-voltage curves of atomic-sized transition metal contacts: an explanation of why Au is Ohmic and Pt is not.
Phys Rev Lett
; 89(6): 066804, 2002 Aug 05.
Article
em En
| MEDLINE
| ID: mdl-12190601
ABSTRACT
We present an experimental study of current-voltage (I-V) curves on atomic-sized Au and Pt contacts formed under cryogenic vacuum (4.2 K). Whereas I-V curves for Au are almost Ohmic, the conductance G=I/V for Pt decreases with increasing voltage, resulting in distinct nonlinear I-V behavior. The experimental results are compared with first principles density functional theory calculations for Au and Pt, and good agreement is found. The difference in conductance properties for Pt vs Au can be explained by the underlying electron valence structure Pt has an open d shell while Au has not.
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Base de dados:
MEDLINE
Idioma:
En
Ano de publicação:
2002
Tipo de documento:
Article