title: Breakdown of hydrodynamic transport theory in the ordered phase of helimagnets.
abstract: 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.
authors.affiliation: Institute for Physical Science and Technology and Department of Physics, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: T R
authors.initials: TR
authors.lastname: Kirkpatrick
authors.forename: D
authors.initials: D
authors.lastname: Belitz