In the highly frustrated disordered spin-1/2 J1-J2 Heisenberg model, the ground state is a valence bond glass whose collective singlet excitations yield a field-insensitive specific-heat anomaly.
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YbCu1.14Se2 exhibits random singlet physics driven by exchange disorder in its 2D triangular lattice rather than quantum spin liquid behavior.
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Valence Bond Glass and Glassy Spin Liquid in Disordered Frustrated Magnets
In the highly frustrated disordered spin-1/2 J1-J2 Heisenberg model, the ground state is a valence bond glass whose collective singlet excitations yield a field-insensitive specific-heat anomaly.
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Random singlet physics in exchange disordered 2D triangular YbCu$_{1.14}$Se$_2$
YbCu1.14Se2 exhibits random singlet physics driven by exchange disorder in its 2D triangular lattice rather than quantum spin liquid behavior.