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TT: Fachverband Tiefe Temperaturen

TT 11: Poster Session: Matter at Low Temperature

TT 11.10: Poster

Montag, 14. März 2011, 14:00–18:00, P4

Setup of a STM Operating at milliKelvin Temperature — •Udai Raj Singh, Mostafa Enayat, Seth Cullen White, and Peter Wahl — Max-Planck-Institute for Solid State Research, Stuttgart, Germany

We present the set-up of a dilution-refrigerator based spectroscopic imaging scanning tunneling microscope. The STM can operate at temperatures down to below 10mK and in magnetic fields up to 14T to allow for studies of unconventional superconductors and heavy fermion materials. The system provides a continuous measurement time on the order of 150 hours and allows for sample transfer and in-situ sample cleavage. We present first results obtained at T_MXC ≈ 9 mK on a NbSe₂ sample. To determine the energy resolution we have measured the superconducting gap of Aluminum. By fitting a BCS gap function to the spectra we have found the electronic resolution of our STM to be around 150 mK.