TY  - EJOUR
AU  - Esat, Taner
AU  - Yang, Xiaosheng
AU  - Mustafayev, Farhad
AU  - Soltner, Helmut
AU  - Tautz, Frank Stefan
AU  - Temirov, Ruslan
TI  - How cold is the junction of a millikelvin scanning tunnelling microscope?
PB  - arXiv
M1  - FZJ-2025-02311
PY  - 2022
AB  - 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.
KW  - Mesoscale and Nanoscale Physics (cond-mat.mes-hall) (Other)
KW  - FOS: Physical sciences (Other)
LB  - PUB:(DE-HGF)25
DO  - DOI:10.48550/ARXIV.2210.11908
UR  - https://juser.fz-juelich.de/record/1041554
ER  -