BaCe2ZnS5 is a quantum paramagnet whose intra-dimer exchange is XY-type, giving an entangled ground state (|↑↑> - |↓↓>)/√2 instead of a Heisenberg singlet.
Quantum spin ice: a search for gapless quantum spin liquids in pyrochlore magnets,
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Quantum entanglement of XY-type spin dimers in Shastry-Sutherland lattice
BaCe2ZnS5 is a quantum paramagnet whose intra-dimer exchange is XY-type, giving an entangled ground state (|↑↑> - |↓↓>)/√2 instead of a Heisenberg singlet.