Effective Spin-12 Description of Transverse-Field-Induced Random Fields in Dipolar Spin Glasses with Strong Single-Ion AnisotropyPhysical Review B (2008)
We present analytical and numerical evidence for the validity of an effective Seff=12 approach to the description of random field generation in S⩾1, and especially for S=1, dipolar spin-glass models with strong uniaxial Ising anisotropy and subject to weak external magnetic field Bx transverse to the Ising direction. Explicitly Bx-dependent random fields are shown to naturally emerge in the effective low-energy description of a microscopic S=1 toy model. We discuss our results in relation to recent theoretical studies pertaining to the topic of Bx-induced random fields in LiHoxY1−xF4 magnetic materials with the Ho3+ Ising moments subject to a transverse field. We show that the Seff=12approach is able to capture both the qualitative and quantitative aspects of the physics at small Bx, giving results that agree with those obtained using conventional second-order perturbation theory.
Publication DateJanuary 22, 2008
Citation InformationS. M. Ali Tabei, F. Vernay and M.J.P. Gingras. "Effective Spin-12 Description of Transverse-Field-Induced Random Fields in Dipolar Spin Glasses with Strong Single-Ion Anisotropy" Physical Review B Vol. 77 Iss. 01 (2008)
Available at: http://works.bepress.com/sm-tabei/11/