Effects of substituting rare-earth ion R by non-magnetic impurities in R2BaNiO5 - theory and numerical DMRG results
Abstract
In this paper we study the effect of substituting R (rare-earth ion) by non-magnetic ions in the spin-1 chain material R2BaNiO5. Using a strong-coupling expansion and numerical density matrix renormalization group calculations, we show that spin-wave bound states are formed at the impurity site. Experimental consequences of the bound states are pointed out.
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