title: Dynamic spin ice: Pr2Sn2O7.
abstract: In this Letter, we report a new spin ice--Pr2Sn2O7--which appears to have enhanced residual entropy due to the dynamic nature of the spins. Neutron scattering experiments show that at 200 mK, there is a significant amount of magnetic diffuse scattering which can be fit to the dipolar spin-ice model. However, these short-ranged ordered spins have a quasielastic response that is atypical of the canonical spin ices, and suggests that the ground state is dynamic (i.e., composed of locally ordered two-in-two-out spin configurations that can tunnel between energetically equivalent orientations). We report this as an example of a dynamic spin ice down to 200 mK.
authors.affiliation: Department of Physics, Florida State University, Tallahassee, Florida 32306-3016, USA.
authors.forename: H D
authors.initials: HD
authors.lastname: Zhou
authors.forename: C R
authors.initials: CR
authors.lastname: Wiebe
authors.forename: J A
authors.initials: JA
authors.lastname: Janik
authors.forename: L
authors.initials: L
authors.lastname: Balicas
authors.forename: Y J
authors.initials: YJ
authors.lastname: Yo
authors.forename: Y
authors.initials: Y
authors.lastname: Qiu
authors.forename: J R D
authors.initials: JR
authors.lastname: Copley
authors.forename: J S
authors.initials: JS
authors.lastname: Gardner