Improved accessibility to the microkelvin temperature regime is important for future research in quantum materials; for quantum information science; and for applications of quantum sensors. Here we report the design and performance of a microkelvin platform based on a nuclear demagnetization stage, engineered and well optimized for operation on a standard cryogen-free dilution refrigerator. PrNi5 is used as the dominant refrigerant. The platform provides a large area for mounting experiments in an ultralow temperature, low electromagnetic noise environment. The performance is characterized using current sensing noise thermometry. Temperatures as low as 395 μK have been reached, and a protocol has been established in which it is possible to operate experiments below 1 mK for 95% of the time, providing an efficient cryogen-free microkelvin environment for a wide range of science applications
@article{arxiv.2209.07903,
title = {High performance cryogen-free microkelvin platform},
author = {Jan Nyéki and Marijn Lucas and Petra Knappová and Lev V. Levitin and Andrew Casey and John Saunders and Harriet van der Vliet and Anthony J. Matthews},
journal= {arXiv preprint arXiv:2209.07903},
year = {2022}
}