Universität zu Köln

Esat, Taner ORCID: 0000-0003-1094-3718, Borgens, Peter, Yang, Xiaosheng ORCID: 0000-0002-7632-0401, Coenen, Peter, Cherepanov, Vasily, Raccanelli, Andrea ORCID: 0000-0001-5341-2656, Tautz, F. Stefan and Temirov, Ruslan ORCID: 0000-0001-8290-6831 (2021). A millikelvin scanning tunneling microscope in ultra-high vacuum with adiabatic demagnetization refrigeration. Rev. Sci. Instrum., 92 (6). MELVILLE: AIP Publishing. ISSN 1089-7623

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Abstract

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 mu K 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. (C) 2021 Author(s).

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Esat, Taner UNSPECIFIED orcid.org/0000-0003-1094-3718 UNSPECIFIED Borgens, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Yang, Xiaosheng UNSPECIFIED orcid.org/0000-0002-7632-0401 UNSPECIFIED Coenen, Peter UNSPECIFIED UNSPECIFIED UNSPECIFIED Cherepanov, Vasily UNSPECIFIED UNSPECIFIED UNSPECIFIED Raccanelli, Andrea UNSPECIFIED orcid.org/0000-0001-5341-2656 UNSPECIFIED Tautz, F. Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Temirov, Ruslan UNSPECIFIED orcid.org/0000-0001-8290-6831 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-589850
DOI:	10.1063/5.0050532
Journal or Publication Title:	Rev. Sci. Instrum.
Volume:	92
Number:	6
Date:	2021
Publisher:	AIP Publishing
Place of Publication:	MELVILLE
ISSN:	1089-7623
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SPECTROSCOPY; LIQUID-HE-3 Multiple languages Instruments & Instrumentation; Physics, Applied Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58985