Magnon Heat Transport in doped $\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$

Abstract

We present results of the thermal conductivity of $\mathrm{L}{\mathrm{a}}_2\mathrm{Cu}{\mathrm{O}}_4$ and $\mathrm{L}{\mathrm{a}}_{1.8}\mathrm{E}{\mathrm{u}}_{0.2}\mathrm{Cu}{\mathrm{O}}_4$ 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 CuO${}_2$ planes. Non-magnetic Zn substituted for Cu gradually suppresses this magnon thermal conductivity ${\kappa }_{\mathrm{mag}}$. A semiclassical analysis of ${\kappa }_{\mathrm{mag}}$ is shown to yield a magnon mean free path which scales linearly with the reciprocal concentration of Zn-ions.

4 pages, 3 figures

References in corpus (1)

• Thermal conductivity of anisotropic and frustrated spin-1/2 chains

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