In the Ising-like triangular antiferromagnet Er7TaO12, long-range magnetic order forms on cooling then melts into short-range correlations at lower temperature, realizing a spin analog of the Pomeranchuk effect.
Saito,et al., Isospin Pomeranchuk effect in twisted bilayer graphene.Nature592(7853), 220–224 (2021)
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Melting upon cooling in a quantum magnet
In the Ising-like triangular antiferromagnet Er7TaO12, long-range magnetic order forms on cooling then melts into short-range correlations at lower temperature, realizing a spin analog of the Pomeranchuk effect.