Abstract
Recently a ferrimagnetic quantum spin chain consisting of Ni and Mn ions has been synthesized to create a new type of magnet with a long life time, based on the Glauber's slow dynamics. Its magnetic properties are well described by the ( s , S ) = ( 1 , 2 ) spin alternating chain model, with single-ion anisotropies D 1 and D 2 at Ni and Mn sites, respectively. Thus we investigate the magnetization process of this model, using the numerical exact diagonalization and finite-size scaling technique. It predicts a new field-induced quantum phase transition between two different Tomonaga–Luttinger liquid phases; TLL1 and TLL2 for some negative values of D 1 and D 2 . This transition corresponds to a quantum version of the spin flop. Some typical phase diagrams are presented.
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