Ferromagnetism and Glassiness in a Disordered Ising Magnet
ORAL
Abstract
LiHo$_{0.20}$Y$_{0.80}$F$_{4}$ is a diluted, dipolar-coupled Ising magnet on the boundary between ferromagnet and spin glass. Application of a magnetic field transverse to the Ising axis introduces quantum tunneling modes that speed relaxation and drive an order-disorder transition. We determine the Transverse Field - Temperature phase diagram through measurements of the linear and nonlinear magnetic susceptibility, as well as the spectral response of the system.
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