title: Thermal conductivity of Ho2Ti2O7 along the [111] direction.
abstract: Thermal transport measurements have been made on the spin-ice material Ho(2)Ti(2)O(7) in an applied magnetic field with both the heat current and the field parallel to the [111] direction for temperatures from 50 mK to 1.2 K. A large magnetic field >6 T is applied to suppress the magnetic contribution to the thermal conductivity in order to extract the lattice conductivity. The low field thermal conductivity thus reveals a magnetic field dependent contribution to the conductivity which both transfers heat and scatters phonons. We interpret these magnetic excitations as monopolelike excitations and describe their behavior via existing Debye-Hückel theory.
authors.affiliation: Guelph-Waterloo Physics Institute, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
authors.forename: W H
authors.initials: WH
authors.lastname: Toews
authors.forename: Songtian S
authors.initials: SS
authors.lastname: Zhang
authors.forename: K A
authors.initials: KA
authors.lastname: Ross
authors.forename: H A
authors.initials: HA
authors.lastname: Dabkowska
authors.forename: B D
authors.initials: BD
authors.lastname: Gaulin
authors.forename: R W
authors.initials: RW
authors.lastname: Hill