Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 47: Poster Tuesday: Scanning Probe Techniques

O 47.10: Poster

Dienstag, 2. April 2019, 18:00–20:00, Poster D

A cryogen-free low-temperature scanning tunneling microscope — •Lukas Arnhold1, Gregory McMurtrie1, Stephan Spieker1, Luigi Malavolti1,2, and Sebastian Loth11Universität Stuttgart — 2Max-Planck-Institut für Festkörperforschung

State of the art Scanning Tunneling Microscopes (STM) are inherently limited in their continuous measurement time by their cryocooling systems, making the acquisition of high resolution differential conductivity maps and other time consuming experiments challenging.

Gifford-McMahom (GM) cryocoolers [1] feature an extremely long hold time [2], but tend to introduce a degree of vibration which aggravates their use in scanning probe techniques.

In this homebuilt STM, we decouple a GM crycooler from the microscope head using a two-frame support system.

Performance tests indicate sufficient vibration suppression to perform high-quality STM measurements that can last as long as the cryocooler can operate.

Such extended hold-time STM's open the possiblity of investigating novel surfaces with unprecedented resolution and extended parameter spaces.

[1] J. Hacklez, High-stability cryogenic scanning tunneling microscope based on a closed-cycle cryostat, Review of Scientific Instruments 85, 103704 (2014) [2] S. Zhang, A cryogen-free low temperature scanning tunneling microscope capable of inelastic electron tunneling spectroscopy, Review of Scientific Instruments 87, 063701 (2016)

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