Yb2Be2SiO7 hosts a dimer ground state of (|↑↑⟩ - |↓↓⟩)/√2 or (|↑↑⟩ + |↓↓⟩)/√2, an Sz≠0 entangled state, rather than the conventional Heisenberg singlet.
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Novel bipartite entanglement in the quantum dimer magnet Yb$_2$Be$_2$SiO$_7$
Yb2Be2SiO7 hosts a dimer ground state of (|↑↑⟩ - |↓↓⟩)/√2 or (|↑↑⟩ + |↓↓⟩)/√2, an Sz≠0 entangled state, rather than the conventional Heisenberg singlet.