Breakdown of Hydrodynamic Transport Theory in the Ordered Phase of Helimagnets

Details Breakdown of Hydrodynamic Transport Theory in the Ordered Phase of Helimagnets Breakdown of Hydrodynamic Transport Theory in the Ordered Phase of Helimagnets

2006-08-09

arxiv.org/abs/cond-mat/0608218v1

Phys. Rev. Lett. 97, 267205 (2006)

Physics

Condensed Matter

Statistical Mechanics

4pp., 1 eps figure

Scientific paper

It is shown that strong fluctuations preclude a hydrodynamic description of transport phenomena in helimagnets, such as MnSi, at T>0. This breakdown of hydrodynamics is analogous to the one in chiral liquid crystals. Mode-mode coupling effects lead to infinite renormalizations of various transport coefficients, and the actual macroscopic description is nonlocal. At T=0 these effects are weakened due to the fluctuation-dissipation theorem, and the renormalizations remain finite. Observable consequences of these results, as manifested in the neutron scattering cross-section, are discussed

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