Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3
arXiv:cond-mat/9810265 · doi:10.1103/PhysRevLett.82.4711
Abstract
Spin excitations of single crystal Fe0.7Al0.3 were investigated over a wide range in energy and reciprocal space with inelastic neutron scattering. In the ferromagnetic phase, propagating spin wave modes become paramagnon-like diffusive modes beyond a critical wave vector q0, indicating substantial disorder in the long-range ordered state. In the spin glass phase, spin dynamics is strongly q-dependent, suggesting remnant short-range spin correlations. Quantitative model for S(energy,q) in the ``ferromagnetic'' phase is determined.
4 pages, 5 figures