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Arrangement of the spins in a triangular lattice: Two spins each form a pair, whereby their magnetic moments cancel each other out when viewed from the outside.
CREDIT
University of Stuttgart, PI1
Abstract:
When temperatures drop below zero degrees Celsius, water turns to ice. But does everything actually freeze if you just cool it down enough? In the classical picture, matter inherently becomes solid at low temperatures. Quantum mechanics can, however, break this rule. Therefore, helium gas, for example, can become liquid at -270 degrees, but never solid under atmospheric pressure: There is no helium ice.