Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 22: Other Low Temperature Topics: Poster Session

TT 22.3: Poster

Montag, 16. März 2015, 15:00–18:00, Poster B

Compact 11 mK scanning tunneling microscope — •Timofey Balashov and Wulf Wulfhekel — Physikalisches Institut, Karlsruhe Institute of Technology, Karlsruhe, Germany

A new scanning tunneling microscope (STM) working at 11 mK with low noise, high stability and high energy resolution was developed for the measurement of magnetic and vibronic excitations.

Advances in dilution refrigerator technology allow for a compact design with direct transfer under vision of both tip and sample into the STM, as well as material deposition at low temperature. An additional vacuum chamber serves for in-situ preparation of tips and samples.

The cryostat reaches the operating temperature in less than 5 hours after sample transfer, and has a low helium consumption of less than 200 ml/hour. A superconducting coil provides an out-of-plane magnetic field of up to 8 Tesla (projected). The vertical stability of the tunnel junction is below 1 pm (peak to peak) and the electric noise floor of tunneling current is about 2 fm/√Hz.