Staggered long-range order for diluted quantum spin models
  We study an annealed site diluted quantum XY model with spin $S\in \frac{1}{2}\mathbb{N}$. We find regions of the parameter space where, in spite of being a priori favourable for a densely occupied state, phases with staggered occupancy occur at low temperatures. 
Roman Koteck\'y and Benjamin Lees
cond-mat.stat-mech math-ph math.MP