Magnon heat transport in doped La2CuO4.
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.
Hess
C
C
2. Physikalisches Institut, RWTH-Aachen, 52056 Aachen, Germany. christian.hess@physics.unige.ch
Büchner
B
B
Ammerahl
U
U
Colonescu
L
L
Heidrich-Meisner
F
F
Brenig
W
W
Revcolevschi
A
A