“…2,4,5 High pressure measurements at cryogenic temperatures of 4 K and below have been performed using a wide range of experimental techniques, including electrical transport, [4][5][6][7][8][9][10] magnetic susceptibility, 7,9,11 Shubnikov-de Haas and de Haas-van Alphen quantum oscillations, 12,13 infrared and Raman spectroscopy, 14,15 and neutron and x-ray magnetic diffraction. 10,[16][17][18][19] Pressure-driven experiments at temperatures below 1 K (Refs. 4, 6, 9, and 20) entail the use of cryostats such as recirculating helium-3 (Ref.…”