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Atomic resolution STM in a cryogen free dilution refrigerator at 15 mK
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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 (MRFM) at milli-kelvin temperatures for which the cryostat is intended. With these modifications we show atomic resolution STM on graphite. This is promising for scanning probe microscopy applications at very low temperatures.
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Vibrational sensing at mK temperatures in dry dilution refrigerators using commercial accelerometers for diverse fundamental physics applications
Commercial Endevco 2271A accelerometers operated at 8 mK on a dilution-refrigerator mixing-chamber plate and resolved pulse-tube harmonics, with a radioassay bounding their 40K/232Th contamination.
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