Berlin 2012 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 35: Focused Session: Charge and Spin Transport through Junctions at the Nanometre Scale

TT 35.2: Hauptvortrag

Donnerstag, 29. März 2012, 10:10–10:50, H 0104

Electronic transport and magnetism in one-atom contacts — •Carlos Untiedt — Dep. Fisica Aplicada. Facultad de Ciencias (Fase II). Universidad de Alicante. Alicante. Spain

The smallest object that we could connect to an electronic circuit will be formed by just a single atom. With the use of the Scanning Tunneling Microscope (STM) we can fabricate and modify such bridges. There has been a great advance in the understanding of the electronic properties of these [1]. However it has been very difficult to extract consequences of the magnetism on their transport properties.

Recently we reported the observation of an effective Kondo screening of the magnetic moment of one-atom contacts between pure ferromagnetic metals by the conduction electrons [2]. Using a STM or Electromigrated Break Junctions we fabricated atomic contacts on these ferromagnetic materials and Fano-Kondo resonances where found in the conductance with the characteristic behavior of a Kondo system.

One of the advantages of our set-up configuration is the capability of the STM to study and analyze hundreds of atomic contacts. This has given us the unique opportunity of performing statistics on the Fano parameters of our conductance curves. A statistical analysis allow us to discuss on the dependence of the Kondo system with the different degrees of couplings to the environment. Finally we will show some of our latest results including Pt chains suggesting a magnetic moment being developed.
Agraït,Yeyati, Ruitenbeek, Phys. Rep. 377 (2003)
Nature 458, 1150(2009)