Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2010-05-26
Phys. Rev. B 82, 132403 (2010)
Physics
Condensed Matter
Statistical Mechanics
4 pages, 5 figures
Scientific paper
10.1103/PhysRevB.82.132403
We study the S>1 nearest-neighbor Heisenberg model with a ferromagnetic interaction J and a large non-collinear <111> easy-axis anisotropy D on a pyrochlore lattice. For a finite D>>|J|, the low-energy physics is described by a < 111 > Ising model with second- and third-neighbor exchange interactions. The extensive degeneracy of the ground state manifold in the infinite anisotropic limit is lifted by the transverse quantum fluctuations, and a q=0 ordered state is selected via the quantum order by disorder machanism, through a first-order phase transition at low temperature.
Chou Yang-Zhi
Kao Ying-Jer
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