physicsworld.com

Sodium nanoparticles of 5,000 to 10,000 atoms diffract through ultraviolet laser gratings, reaching macroscopicity μ = 15.5 in a Nature paper from the Arndt group.

Two back-to-back Nature papers show that removing excess iron atoms from iron telluride unlocks superconductivity at 13.5 Kelvin, overturning a longstanding assumption and suggesting similar hidden quantum states may exist in other correlated materials.