Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3

Details Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3 Unconventional ferromagnetic and spin-glass states of the reentrant spin glass Fe0.7Al0.3

1998-10-20

arxiv.org/abs/cond-mat/9810265v2

published as Phys. Rev. Lett. Vol 82, 4711 (1999)

Physics

Condensed Matter

Disordered Systems and Neural Networks

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.82.4711

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.

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