Induced Random Fields in the LiHoxY1−xF4 Quantum Ising Magnet in a Transverse Magnetic FieldPhysical Review Letters (2006)
The LiHoxY1−xF4 magnetic material in a transverse magnetic field Bxxˆ perpendicular to the Ising spin direction has long been used to study tunable quantum phase transitions in a random disordered system. We show that the Bx-induced magnetization along the xˆ direction, combined with the local random dilution-induced destruction of crystalline symmetries, generates, via the predominant dipolar interactions between Ho3+ ions, random fields along the Ising zˆ direction. This identifies LiHoxY1−xF4 in Bx as a new random field Ising system. The random fields explain the rapid decrease of the critical temperature in the diluted ferromagnetic regime and the smearing of the nonlinear susceptibility at the spin-glass transition with increasing Bx and render the Bx-induced quantum criticality in LiHoxY1−xF4 likely inaccessible.
Publication DateDecember 7, 2006
Citation InformationS. M. Ali Tabei, M.J.P. Gingras, Y.J. Kao, P. Stasiak, et al.. "Induced Random Fields in the LiHoxY1−xF4 Quantum Ising Magnet in a Transverse Magnetic Field" Physical Review Letters Vol. 97 Iss. 23 (2006)
Available at: http://works.bepress.com/sm-tabei/12/