Exchange anisotropy Δ in X₂YCo(PO₄)₂ and X₂Co(SeO₃)₂ families is determined by the ratio of trigonal crystal field to spin-orbit coupling, providing a microscopic design rule for spin supersolids.
Absence of high-field spin supersolid phase in Rb 2Co(SeO3)2 with a triangular lat- tice
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High-field experiments identify a spin supersolid phase and quantum criticality in Rb2Co(SeO3)2, establishing it as a candidate for magnetocaloric cooling at low temperatures.