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Magnetic atoms in a solid are like compass needles: usually, when cooled, they align in one direction: that's how magnetism arises. But in TbInO3, the terbium needles sit on a triangular lattice where it's impossible to please all neighbors at once. One needle wants to point north, another south, and in the end none can settle into a stable position.

The scientists grew an ultrathin film of this material and cooled it to 20 millikelvin — a hundred times colder than the temperature at which the needles should have aligned according to simple estimates. Even at such cold, order did not emerge: the needles kept fluctuating, like a liquid that never freezes into ice. To observe this, the physicists used superconducting resonators — devices that pick up weak magnetic signals from tiny samples, like a keen ear catching a whisper in a quiet room.

This result is an important step toward detecting a quantum spin liquid. In this state, magnetic needles do not freeze even at absolute zero but continuously fluctuate, forming an entangled collective state. Understanding such materials could help create new quantum technologies where information is stored in elusive collective motions rather than in individual particles.