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Elastic anomalies in iron-platinum invar alloys : The 5th Joint MMM−Intermag Conference (1991)

Kawald, U. ; Schulenberg, P. ; Bach, H. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 70 (1991), S. 6537-6539

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Elastic anomalies in an Fe75Pt25 single crystal have been investigated by ultrasonic pulse echo and inelastic neutron scattering measurements in the temperature range 200 to 800 K. The single crystal which was grown by the Bridgman–Stockbarger process undergoes a magnetic transition at Tc = 370 K and a martensitic transformation at Ms = 200 K corresponding to a degree of order of S=0.7. Both ultrasonics and neutron scattering reveal a softening of the transverse modes below Tc. The excess elastic constants obey an M2 law as expected from a local magnetoelastic interaction model. The longitudinal ultrasonic velocities already start to soften at 700 K whereas the neutron data for the same acoustic branch do not show any anomaly down to 200 K. The observed q dependences of the acoustic branches point towards a softening confined to the very center of the Brillouin zone.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.349899

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