Noise thermometry at ultra low temperatures
作者： D. Rothfuß , A. Reiser , A. Fleischmann , C. Enss
DOI: 10.1063/1.4816760
关键词: Orders of magnitude (temperature) 、 Magnetic field 、 Electron 、 Magnetometer 、 Analytical chemistry 、 Optics 、 Noise (radio) 、 Thermometer 、 Chemistry 、 Amplifier 、 Order of magnitude
摘要: We present a contact free cross-correlation noise thermometer experimentally characterized for temperatures between 0.8 K and 45 μK. The source is cold-worked copper cylinder. fluctuations of magnetic fields due to the thermal motion electrons in cylinder are simultaneously monitored by two superconducting quantum interference device magnetometers. A subsequent both channels reduces contribution amplifiers more than one order magnitude. This technique covers almost five orders magnitude temperature including ultra low temperatures, which were accessible only platinum nuclear resonance thermometers so far.
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