Regensburg 2004 – wissenschaftliches Programm

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O: Oberflächenphysik

O 23: Rastersondentechniken II

O 23.6: Vortrag

Dienstag, 9. März 2004, 17:00–17:15, H36

An Ultra High Vacuum Scanning Tunneling Microscope system operating at 300 mK and 14 T — •Focko Meier1, Jens Wiebe1, Andre Wachowiak2, Daniel Haude1, Markus Morgenstern1, and Roland Wiesendanger11Institute of Applied Physics, Hamburg University, Jungiusstr. 11, D-20355 Hamburg, Germany — 2University of California at Berkeley, Department of Physics, 366 Le Conte Hall, 7300 Berkeley, CA 94720-7300, USA

For scanning tunneling spectroscopy (STS) on low dimensional electron systems, an ultra high vacuum (UHV) scanning tunneling microscope (STM) operating at T=300 mK and in magnetic fields up to B=14 T has been built up.

The STM sitting in a bakeable UHV-insert within the 3He-cryostat can be operated continuously for about 30 hours witout any refill of the cryogenic liquid. It achieves a z-noise level below 5 pm. Using superconducting tips and samples first experimental STS results show that the energy resolution reached is close to the predicted theoretical limit of 75 µ V. For exchanging tips and samples the insert with STM can be moved to a UHV chamber. Further connected UHV chambers contain different equipment for tip and sample preparation and characterisation, i.e. a RT-STM , a LEED/Auger system, several evaporators and a variable temperature system to detect the magnetooptical Kerr-effect (MOKE).

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