Heisenberg antiferromagnets with exchange and cubic anisotropies
نویسنده
چکیده
We study classical Heisenberg antiferromagnets with uniaxial exchange anisotropy and a cubic anisotropy term on simple cubic lattices in an external magnetic field using ground state considerations and extensive Monte Carlo simulations. In addition to the antiferromagnetic phase field–induced spin–flop and non–collinear, biconical phases may occur. Phase diagrams and critical as well as multicritical phenomena are discussed. Results are compared to previous findings.
منابع مشابه
Classical and quantum anisotropic Heisenberg antiferromagnets
We study classical and quantum Heisenberg antiferromagnets with exchange anisotropy of XXZ–type and crystal field single–ion terms of quadratic and cubic form in a field. The magnets display a variety of phases, including the spin–flop (or, in the quantum case, spin–liquid) and biconical (corresponding, in the quantum lattice gas description, to supersolid) phases. Applying ground–state conside...
متن کاملStudies of Fcc Heisenberg Antiferromagnets by Monte Carlo Simulation on Large Spin Arrays
,We report Monte Carlo studies of fcc Heisenberg antiferromagnets carried out on arrays with 108,000 spins. A lattice w&h only JNN # 0 was found to exhibit a Type I AI? order despite the disordered nature of its ground state. Contrary to previous reports, our data indicate in this case a first order phase transition. So far, all reported Monte Carlo (MC) studies of fcc Heisenberg antiferromagne...
متن کاملNonplanar ground states of frustrated antiferromagnets on an octahedral lattice
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. We consider methods to identify the classical ground state for an exchange-coupled Heisenberg antiferromagnet on a ...
متن کاملQuantum Heisenberg antiferromagnetic chains with exchange and single–ion anisotropies
Using density matrix renormalization group calculations, ground state properties of the spin–1 Heisenberg chain with exchange and quadratic single–ion anisotropies in an external field are studied, for special choices of the two kinds of anisotropies. In particular, the phase diagram includes antiferromagnetic, spin–liquid (or spin–flop), (10), and supersolid (or biconical) phases. Especially, ...
متن کاملFrustrated Quantum Antiferromagnets: Application of High-order Coupled Cluster Method
We report on recent results for strongly frustrated quantum J1–J2 antiferromagnets in dimensionality d = 1, 2, 3 obtained by the coupled cluster method (CCM). We demonstrate that the CCM in high orders of approximation allows us to investigate quantum phase transitions driven by frustration and to discuss novel quantum ground states. In detail we consider the ground-state properties of (i) the ...
متن کامل