Ballistic magnon transport and phonon scattering in the antiferromagnet Nd$_2$CuO$_4$

Details Ballistic magnon transport and phonon scattering in the antiferromagnet Nd$_2$CuO$_4$ Ballistic magnon transport and phonon scattering in the antiferromagnet Nd$_2$CuO$_4$

2005-01-11

arxiv.org/abs/cond-mat/0501220v2

Phys. Rev. Lett. 95, 156603 (2005)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures, one figure modified

Scientific paper

10.1103/PhysRevLett.95.156603

The thermal conductivity of the antiferromagnet Nd$_2$CuO$_4$ was measured down to 50 mK. Using the spin-flop transition to switch on and off the acoustic Nd magnons, we can reliably separate the magnon and phonon contributions to heat transport. We find that magnons travel ballistically below 0.5 K, with a thermal conductivity growing as $T^3$, from which we extract their velocity. We show that the rate of scattering of acoustic magnons by phonons grows as $T^3$, and the scattering of phonons by magnons peaks at twice the average Nd magnon frequency.

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