Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2007-08-27
Phys.Rev. B 77, 024401 (2008)
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 4 figures
Scientific paper
10.1103/PhysRevB.77.024401
The frustrated spin-1/2 model with weakly anisotropic ferromagnetic nearest-neighbor and antiferromagnetic next-nearest-neighbor exchanges is studied with use of variational mean-field approach, scaling estimates of the infrared divergencies in the perturbation theory and finite-size calculations. The ground state phase diagram of this model contains three phases: the ferromagnetic phase, the commensurate spin-liquid phase and the incommensurate phase. The non-trivial behavior of the boundaries between these phases and the character of the phase transitions in case of weak anisotropy are determined.
Dmitriev D. V.
Krivnov Ya. V.
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