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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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.