In solid-state physics, spin liquid denotes a state of matter, where local permanent magnetic moments are present in the material, but do not show any sign of ordering down to the lowest temperatures despite comparable strong antiferromagnetic interactions. Even though many theories study spin liquids, no definite spin-liquid material has been found yet, although there are a few possible spin liquid candidates under investigation.Localized spins are frustrated if there exist competing exchange interactions that can not all be satisfied at the same time leading to a large degeneracy of the system's ground state. A triangle of Ising spins (meaning the only possible orientations of the spins are "up" and "down"), which interact antiferromagnetically, is a simple example for frustration. In the ground state, two of the spins can be antiparallel but the third one can not.
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