A generalized Shastry-Sutherland model is used to show that the pVBS-to-Néel transition is weakly first-order in the SS limit and becomes continuous near the J1-J2 limit, implying a tri-critical point.
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From the Shastry-Sutherland model to the $J_1$-$J_2$ Heisenberg model
A generalized Shastry-Sutherland model is used to show that the pVBS-to-Néel transition is weakly first-order in the SS limit and becomes continuous near the J1-J2 limit, implying a tri-critical point.