2 research outputs found
How cold is the junction of a millikelvin scanning tunnelling microscope?
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 is decoupled from the temperature of the
surrounding environment . Simulating the STS data with the
theory, we determine that K, while the
fitting of the superconducting gap spectrum yields the lowest mK.Comment: 12 pages, 10 figure