Field-induced XY behavior in the S=1/2 antiferromagnet on the square lattice

Details Field-induced XY behavior in the S=1/2 antiferromagnet on the square lattice Field-induced XY behavior in the S=1/2 antiferromagnet on the square lattice

2003-02-21

arxiv.org/abs/cond-mat/0302440v1

Phys. Rev. B 68, 060402 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.060402

Making use of the quantum Monte Carlo method based on the worm algorithm, we study the thermodynamic behavior of the S=1/2 isotropic Heisenberg antiferromagnet on the square lattice in a uniform magnetic field varying from very small values up to the saturation value. The field is found to induce a Berezinskii-Kosterlitz-Thouless transition at a finite temperature, above which a genuine XY behavior in an extended temperature range is observed. The phase diagram of the system is drawn, and the thermodynamic behavior of the specific heat and of the uniform and staggered magnetization is discussed in sight of an experimental investigation of the field-induced XY behavior.

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