title: Magnon heat transport in doped La2CuO4.
abstract: We present results of the thermal conductivity of La2CuO4 and La(1.8)Eu(0.2)CuO4 single crystals which represent model systems for the two-dimensional spin-1/2 Heisenberg antiferromagnet on a square lattice. We find large anisotropies of the thermal conductivity which are explained in terms of two-dimensional heat conduction by magnons within the CuO2 planes. Nonmagnetic Zn substituted for Cu gradually suppresses this magnon thermal conductivity kappa(mag). A semiclassical analysis of kappa(mag) is shown to yield a magnon mean free path which scales linearly with the reciprocal concentration of Zn ions.
authors.affiliation: 2. Physikalisches Institut, RWTH-Aachen, 52056 Aachen, Germany. christian.hess@physics.unige.ch
authors.forename: C
authors.initials: C
authors.lastname: Hess
authors.forename: B
authors.initials: B
authors.lastname: Büchner
authors.forename: U
authors.initials: U
authors.lastname: Ammerahl
authors.forename: L
authors.initials: L
authors.lastname: Colonescu
authors.forename: F
authors.initials: F
authors.lastname: Heidrich-Meisner
authors.forename: W
authors.initials: W
authors.lastname: Brenig
authors.forename: A
authors.initials: A
authors.lastname: Revcolevschi