Under pressure, 'squishy' compound reacts in remarkable ways

When a compound of manganese and sulfide (MnS2) is compressed in a diamond anvil, it transitions from an insulator into a metallic state and back into an insulator. This is accompanied by unprecedented decreases in resistance and volume across an extremely narrow range of pressure changes at room temperatue, say researchers.

source https://www.sciencedaily.com/releases/2021/07/210727145247.htm