title: Evidence of spin glass dynamics in dilute LiHoxY1-xF4.
abstract: ac susceptibility measurements are presented on the dilute, dipolar coupled, Ising magnet LiHoxY1-xF4 for a concentration x=0.045. The frequency and temperature dependences of the susceptibility show characteristic glassy relaxation. The absorption spectrum is found to broaden with decreasing temperature suggesting that the material is behaving as a spin glass and not as an exotic spin liquid as was previously observed. A dynamical scaling analysis suggests a spin glass transition temperature of 43+/-2 mK with an exponent znu=7.8+/-0.2.
authors.affiliation: Department of Physics and Astronomy, Guelph-Waterloo Physics Institute and Institute for Quantum Computing, University of Waterloo, Waterloo, ON N2L 3G1 Canada.
authors.forename: J A
authors.initials: JA
authors.lastname: Quilliam
authors.forename: S
authors.initials: S
authors.lastname: Meng
authors.forename: C G A
authors.initials: CG
authors.lastname: Mugford
authors.forename: J B
authors.initials: JB
authors.lastname: Kycia