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

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

2011-04-08

arxiv.org/abs/1104.1514v1

Phys. Rev. B 83, 174518 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.83.174518

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

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