In a branched spin-1/2 chain, the intermediate half-magnetization plateau breaks down at a triple point when the side couplings are Ising-like, but at a Kosterlitz-Thouless point when all couplings are Heisenberg.
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Breakdown of intermediate one-half magnetization plateau of spin-1/2 Ising-Heisenberg and Heisenberg branched chains at triple and Kosterlitz-Thouless critical points
In a branched spin-1/2 chain, the intermediate half-magnetization plateau breaks down at a triple point when the side couplings are Ising-like, but at a Kosterlitz-Thouless point when all couplings are Heisenberg.