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We report the magnetic-field dependence of thermal conductivity (\kappa) ofan insulating cuprate Nd_2CuO_4 at very low temperatures down to 0.3 K. It isfound that apart from the paramagnetic moments scattering on phonons, theNd^{3+} magnons can act as either heat carriers or phonon scatterers, whichstrongly depends on the long-range antiferromagnetic transition and thefield-induced transitions of spin structure. In particular, the Nd^{3+} magnonscan effectively transport heat in the spin-flopped state of the Nd^{3+}sublattice. However, both the magnon transport and the magnetic scattering arequenched at very high fields. The spin re-orientations under the in-plane fieldcan be conjectured from the detailed field dependence of \kappa.

Low-temperature heat transport of Nd_2CuO_4: Roles of Nd magnons and spin-structure transitions