Observation of phasons in the magnetic shape memory alloy Ni ₂ MnGa

Abstract

An inelastic neutron scattering study of the lattice dynamics of the\nmartensite phase of the ferromagnetic shape memory alloy, Ni2MnGa, reveals the\npresence of well-defined phasons associated with the charge density wave (CDW)\nresulting from Fermi surface (FS) nesting. The velocity and the temperature\ndependence of the phason are measured as well as the anomalous [110]-TA2\nphonon.\n