Observation of linear spin wave dispersion in the reentrant spin glass Fe 0.7 Al 0.3
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説明
Fe0.7Al0.3 is a reentrant spin glass, which undergoes a transition from a paramagnet to a disordered ferromagnet at Tc∼500 K; at a lower temperature the spins progressively freeze and it exhibits a spin-glass-like behavior. In the ferromagnetic phase spin waves with a q2 dispersion are observed at small q, which broaden rapidly and become diffusive beyond a critical wave vector q0. On cooling the spin waves also disappear and a strong elastic central peak develops. For measurements around the (1,1,1) Bragg peak, a new sharp excitation is observed which has a linear dispersion behavior. It disappears above Tc, but persists throughout the spin-glass phase. It is not present in the stoichiometric Fe3Al material.
収録刊行物
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- Applied Physics A: Materials Science & Processing
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Applied Physics A: Materials Science & Processing 74 s859-s861, 2002-12-01
Springer Science and Business Media LLC
