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Anisotropic low-temperature properties of the cubic spinel helimagnetZnCr2Se4 in the single-domain spin-spiral state are investigated by acombination of neutron scattering, thermal conductivity, ultrasound velocity,and dilatometry measurements. In an applied magnetic field, neutronspectroscopy shows a complex and nonmonotonic evolution of the spin-wavespectrum across the quantum-critical point that separates the spin-spiral phasefrom the field-polarized ferromagnetic phase at high fields. A tiny spin gap ofthe pseudo-Goldstone magnon mode, observed at wave vectors that arestructurally equivalent but orthogonal to the propagation vector of the spinhelix, vanishes at this quantum critical point, restoring the cubic symmetry inthe magnetic subsystem. The anisotropy imposed by the spin helix has only aminor influence on the lattice structure and sound velocity but has a muchstronger effect on the heat conductivities measured parallel and perpendicularto the magnetic propagation vector. The thermal transport is anisotropic at T <2 K, highly sensitive to an external magnetic field, and likely resultsdirectly from magnonic heat conduction. We also report long-time thermalrelaxation phenomena, revealed by capacitive dilatometry, which are due tomagnetic domain motion related to the destruction of the single-domain magneticstate, initially stabilized in the sample by the application and removal ofmagnetic field. Our results can be generalized to a broad class of helimagneticmaterials in which a discrete lattice symmetry is spontaneously broken by themagnetic order.

physical review. b./physical review. b

Magnetic-field dependence of low-energy magnons, anisotropic heat  conduction, and spontaneous relaxation of magnetic domains in the cubic  helimagnet ZnCr2Se4