An ultrahigh-vacuum cryostat for simultaneous scanning tunneling microscopy and magneto-transport measurements down to 400 mK
Autor: | Markus Morgenstern, S. Becker, Florian Muckel, Jan Raphael Bindel, Christian Saunus, Marcus Liebmann, Tjorven Johnsen, Christian R. Ast, Mike Pezzotta |
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Rok vydání: | 2018 |
Předmět: |
Cryostat
Physics - Instrumentation and Detectors Microscope Materials science business.industry Scanning tunneling spectroscopy FOS: Physical sciences Instrumentation and Detectors (physics.ins-det) 02 engineering and technology Superconducting magnet 021001 nanoscience & nanotechnology 01 natural sciences law.invention law 0103 physical sciences Optoelectronics Scanning tunneling microscope Tuning fork 010306 general physics 0210 nano-technology business Spectroscopy Instrumentation Quantum tunnelling |
Zdroj: | The Review of scientific instruments. 88(12) |
ISSN: | 1089-7623 |
Popis: | We present the design and calibration measurements of a scanning tunneling microscope setup in a 3He ultrahigh-vacuum cryostat operating at 400 mK with a hold time of 10 days. With 2.70 m in height and 4.70 m free space needed for assembly, the cryostat fits in a one-story lab building. The microscope features optical access, an xy table, in situ tip and sample exchange, and enough contacts to facilitate atomic force microscopy in tuning fork operation and simultaneous magneto-transport measurements on the sample. Hence, it enables scanning tunneling spectroscopy on microstructured samples which are tuned into preselected transport regimes. A superconducting magnet provides a perpendicular field of up to 14 T. The vertical noise of the scanning tunneling microscope amounts to 1 pmrms within a 700 Hz bandwidth. Tunneling spectroscopy using one superconducting electrode revealed an energy resolution of 120 mueV. Data on tip-sample Josephson contacts yield an even smaller feature size of 60 mueV, implying that the system operates close to the physical noise limit. 12 pages, 11 figures |
Databáze: | OpenAIRE |
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