title: Strong damping of phononic heat current by magnetic excitations in SrCu2(BO3)(2).
abstract: Measurements of the thermal conductivity as a function of temperature and magnetic field in the 2D dimer spin system SrCu2(BO3)(2) are presented. In zero magnetic field the thermal conductivity along and perpendicular to the magnetic planes shows a pronounced double-peak structure as a function of temperature. The low-temperature maximum is drastically suppressed with increasing magnetic field. Our quantitative analysis reveals that the heat current is due to phonons and that the double-peak structure arises from pronounced resonant scattering of phonons by magnetic excitations.
authors.affiliation: II. Physikalisches Institut, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Hofmann
authors.forename: T
authors.initials: T
authors.lastname: Lorenz
authors.forename: G S
authors.initials: GS
authors.lastname: Uhrig
authors.forename: H
authors.initials: H
authors.lastname: Kierspel
authors.forename: O
authors.initials: O
authors.lastname: Zabara
authors.forename: A
authors.initials: A
authors.lastname: Freimuth
authors.forename: H
authors.initials: H
authors.lastname: Kageyama
authors.forename: Y
authors.initials: Y
authors.lastname: Ueda