Preprint

FZJ-2025-02311

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png How cold is the junction of a millikelvin scanning tunnelling microscope?

Esat, T. (First author)FZJ* ; Yang, X.FZJ* ; Mustafayev, F.FZJ* ; Soltner, H.FZJ* ; Tautz, F. S.FZJ* ; Temirov, R. (Corresponding author)FZJ*

2022
arXiv

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Please use a persistent id in citations: doi:10.48550/ARXIV.2210.11908

Abstract: We employ a scanning tunnelling microscope (STM) cooled to millikelvin temperatures by an adiabatic demagnetization refrigerator (ADR) to perform scanning tunnelling spectroscopy (STS) on an atomically clean surface of Al(100) in a superconducting state using normal-metal and superconducting STM tips. Varying the ADR temperatures between 30 mK and 1.2 K, we show that the temperature of the STM junction $T$ is decoupled from the temperature of the surrounding environment $T_{\mathrm{env}}$. Simulating the STS data with the $P(E)$ theory, we determine that $T_{\mathrm{env}} \approx 1.5$ K, while the fitting of the superconducting gap spectrum yields the lowest $T=77$ mK.

Keyword(s): Mesoscale and Nanoscale Physics (cond-mat.mes-hall) ; FOS: Physical sciences

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Contributing Institute(s):

1. Quantum Nanoscience (PGI-3)

Research Program(s):

1. 5213 - Quantum Nanoscience (POF4-521) (POF4-521)

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