Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-08-10
Phys. Rev. B 80, 144417 (2009)
Physics
Condensed Matter
Strongly Correlated Electrons
The final published version
Scientific paper
10.1103/PhysRevB.80.144417
We study the phase diagram of a frustrated spin-1/2 ferromagnetic chain with anisotropic exchange interactions in an external magnetic field, using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency towards multimagnon bound states, while an easy-plane anisotropy favors chirally ordered phases. In particular, a moderate easy-plane anisotropy gives rise to a quantum phase transition at intermediate magnetization. We argue that this transition is related to the finite-field phase transition experimentally observed in the spin-1/2 compound LiCuVO_4.
Heidrich-Meisner Fabian
Kolezhuk Alexei K.
McCulloch Ian P.
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