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Title: Atomic resolution scanning tunneling microscopy in a cryogen free dilution refrigerator at 15 mK

Pulse tube refrigerators are becoming more common, because they are cost efficient and demand less handling than conventional (wet) refrigerators. However, a downside of a pulse tube system is the vibration level at the cold-head, which is in most designs several micrometers. We implemented vibration isolation techniques which significantly reduced vibration levels at the experiment. These optimizations were necessary for the vibration sensitive magnetic resonance force microscopy experiments at milli-kelvin temperatures for which the cryostat is intended. With these modifications we show atomic resolution scanning tunneling microscopy on graphite. This is promising for scanning probe microscopy applications at very low temperatures.
Authors:
; ; ;  [1] ;  [2] ; ;  [3]
  1. Department of Interface Physics, Leiden University, Niels Bohrweg 2, 2333CA Leiden (Netherlands)
  2. Leiden Cryogenics, Kenauweg 11, 2331BA Leiden (Netherlands)
  3. Leiden Spin Imaging (LSI), J.H. Oortweg 21, 2333CH Leiden (Netherlands)
Publication Date:
OSTI Identifier:
22255289
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 85; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; 42 ENGINEERING; CRYOGENIC FLUIDS; CRYOSTATS; DILUTION; GRAPHITE; MAGNETIC RESONANCE; OPTIMIZATION; REFRIGERATORS; SCANNING TUNNELING MICROSCOPY