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O: Fachverband Oberflächenphysik

O 104: Poster Session VIII: Scanning probe techniques: Method development III

O 104.1: Poster

Thursday, March 4, 2021, 13:30–15:30, P

Ultra-high vacuum millikelvin scanning tunnelling microscope with adiabatic demagnetisation refrigeration — •Taner Esat^1,2, Peter Coenen^1,2, Andrea Raccanelli^3,2, Vasily Cherepanov^1,2, Xiaosheng Yang^1,2, Peter Borgens^1,2, Stefan Tautz^1,2, and Ruslan Temirov^1,2,4 — ¹Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich, Germany — ²Jülich Aachen Research Alliance (JARA), Fundamentals of Future Information Technology — ³Cryo-Lab, Peter Grünberg Institute (PGI-3), Forschungszentrum Jülich, Germany — ⁴II. Physikalisches Institut, Universität zu Köln, Germany

We describe the design of an ultra-high vacuum scanning tunnelling microscope that operates at millikelvin temperatures and high magnetic fields of up to 8 Tesla. Employing adiabatic demagnetisation refrigeration technique instead of the traditionally used 3He dilution refrigeration, we have built a very modular setup with outstandingly high stability, allowing STM experiments in very well controlled variable temperature conditions down to 26 millikelvin. To demonstrate the microscope's performance, we show the temperature-dependent scanning tunnelling spectroscopy data acquired on a superconducting Al(100) surface and discuss the factors determining the effective electronic temperature of the STM junction.