Two-dimensional frustrated Heisenberg model: Variational study

Details Two-dimensional frustrated Heisenberg model: Variational study Two-dimensional frustrated Heisenberg model: Variational study

1999-11-30

arxiv.org/abs/cond-mat/9911491v1

Phys.Rev.B 55, 3620 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 4 figures, RevTeX

Scientific paper

10.1103/PhysRevB.55.3620

The stability of the ferromagnetic phase of the 2D quantum spin-1/2 model with nearest-neighbor ferro- and next-nearest neighbor antiferromagnetic interactions is studied. It turns out that values of exchange integrals at which the ferromagnetic state becomes unstable with respect to a creation of one and two magnon are different. This difference shows that the classical approximation is inapplicable to the study of the transition from the ferromagnetic to the singlet state in contrast with 1D case. This problem is investigated using a variational function of new type. It is based on the boson representation of spin operators which is different from the Holstein-Primakoff approximation. This allows us to obtain the accurate estimate of the transition point and to study the character of the phase transition.

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