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001     892836
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245 _ _ |a A millikelvin scanning tunneling microscope in ultra-high vacuum with adiabatic demagnetization refrigeration
260 _ _ |a [S.l.]
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520 _ _ |a We present the design and performance of an ultra-high vacuum scanning tunneling microscope (STM) that uses adiabatic demagnetization of electron magnetic moments for controlling its operating temperature ranging between 30 mK and 1 K with an accuracy of up to 7 μK rms. At the same time, high magnetic fields of up to 8 T can be applied perpendicular to the sample surface. The time available for STM experiments at 50 mK is longer than 20 h, at 100 mK about 40 h. The single-shot adiabatic demagnetization refrigerator can be regenerated automatically within 7 h while keeping the STM temperature below 5 K. The whole setup is located in a vibrationally isolated, electromagnetically shielded laboratory with no mechanical pumping lines penetrating its isolation walls. The 1 K pot of the adiabatic demagnetization refrigeration cryostat can be operated silently for more than 20 days in a single-shot mode using a custom-built high-capacity cryopump. A high degree of vibrational decoupling together with the use of a specially designed minimalistic STM head provides outstanding mechanical stability, demonstrated by the tunneling current noise, STM imaging, and scanning tunneling spectroscopy measurements, all performed on an atomically clean Al(100) surface.
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700 1 _ |a Borgens, Peter
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700 1 _ |a Yang, Xiaosheng
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700 1 _ |a Coenen, Peter
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700 1 _ |a Cherepanov, Vasily
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700 1 _ |a Raccanelli, Andrea
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700 1 _ |a Tautz, F. Stefan
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700 1 _ |a Temirov, Ruslan
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773 _ _ |a 10.1063/5.0050532
|g Vol. 92, no. 6, p. 063701 -
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|t Review of scientific instruments
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|y 2021
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856 4 _ |u https://juser.fz-juelich.de/record/892836/files/RSI_invoice_RSI21-AR-00712_00219.pdf
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