Publication Date:
2017-06-06
Description:
Author(s): N. Prasai, B. A. Trump, G. G. Marcus, A. Akopyan, S. X. Huang, T. M. McQueen, and J. L. Cohn Low-temperature thermal conductivity measurements in the ferrimagnetic insulator Cu 2 OSeO 3 reveal an unprecedentedly large magnonic contribution below T~10K, far exceeding (by nearly two orders of magnitude) that observed previously in any other ferromagnet or ferrimagnet. Features predicted by theory more than 50 years ago are identified, including ballistic behavior with κ m ∝ T 2 , and, possibly, Poiseuille flow, wherein the magnon mean-free path exceeds the specimen dimensions as momentum conserving scattering occurs more frequently than scattering by resistive processes. [Phys. Rev. B 95, 224407] Published Mon Jun 05, 2017
Keywords:
Magnetism
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics