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Phase diagram of ferrimagnetic ladders with bond-alternation

A. Langari·M. Abolfath·M. A. Martin-Delgado
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Abstract

We study the phase diagram of a 2-leg bond-alternation spin-(1/2, 1) ladder for two different configurations using a quantum renormalization group approach. Although d-dimensional ferrimagnets show gapless behavior, we will explicitly show that the effect of the spin mixing and the bond-alternation can open the possibility for observing an energy gap. We show that the gapless phases of such systems can be equivalent to the 1-dimensional half-integer antiferroamgnets, besides the gapless ferrimagnetic phases. We therefore propose a phase transition between these two gapless phases that can be seen in the parameter space.

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A. Langari, M. Abolfath, M. A. Martin-Delgado. 1999-10-07. Phase diagram of ferrimagnetic ladders with bond-alternation. https://doi.org/10.1103/physrevb.61.343

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