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Magnetic phase diagram of a frustrated spin ladder

Sugimoto, Takanori*; Mori, Michiyasu  ; Toyama, Takami; Maekawa, Sadamichi

Frustrated spin ladders show magnetization plateaux depending on the rung-exchange interaction and frustration defined by the ratio of first and second neighbor exchange interactions in each chain. This paper reports on its magnetic phase diagram. Using the variational matrix-product state method, we accurately determine phase boundaries. Several kinds of magnetization plateaux are induced by the frustration and the strong correlation among quasiparticles on a lattice. The appropriate description of quasiparticles and their relevant interactions are changed by a magnetic field. We find that the frustration differentiates the triplet quasiparticle from the single tone in kinetic energy.

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Category:Materials Science, Multidisciplinary

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