title: Study of the ground state properties of LiHo(x)Y(1-x)F4 using muon spin relaxation.
abstract: LiHo(x)Y(1-x)F4 is an insulator where the magnetic Ho3+ ions have an Ising character and interact mainly through magnetic dipolar fields. We used the muon spin relaxation technique to study the nature of its ground state for samples with x ≤ 0.25. In contrast with some previous works, we did not find canonical spin glass behavior down to ≈ 15 mK. Instead, below ≈300 mK we observed temperature-independent dynamic magnetism characterized by a single correlation time. The 300 mK energy scale corresponds to the Ho3+ hyperfine interaction strength, suggesting that this interaction may be involved in the dynamic behavior of the system.
authors.affiliation: Department of Physics and Astronomy, McMaster University, Hamilton, ON, Canada, L8S 4M1. Jose.Rodriguez@psi.ch
authors.forename: J
authors.initials: J
authors.lastname: Rodriguez
authors.forename: A A
authors.initials: AA
authors.lastname: Aczel
authors.forename: J P
authors.initials: JP
authors.lastname: Carlo
authors.forename: S R
authors.initials: SR
authors.lastname: Dunsiger
authors.forename: G J
authors.initials: GJ
authors.lastname: Macdougall
authors.forename: P L
authors.initials: PL
authors.lastname: Russo
authors.forename: A T
authors.initials: AT
authors.lastname: Savici
authors.forename: Y J
authors.initials: YJ
authors.lastname: Uemura
authors.forename: C R
authors.initials: CR
authors.lastname: Wiebe
authors.forename: G M
authors.initials: GM
authors.lastname: Luke