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Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa

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arxiv cond-mat/0106257 v1 pith:JCLEPTDB submitted 2001-06-13 cond-mat.str-el

Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa

Viktor V. Struzhkin , Ho-kwang Mao , Jingzhu Hu , Markus Schwoerer-B\"ohning , Jinfu Shu , Russell J. Hemley , Wolfgang Sturhahn , Michael Y. Hu
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Ercan E. Alp Peter Eng Guoyin Shen
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keywords x-raybeenchangesdensityindicateinelasticnuclearpressure
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The partial density of vibrational states has been measured for Fe in compressed FeO (w\"ustite) using nuclear resonant inelastic x-ray scattering. Substantial changes have been observed in the overall shape of the density of states close to the magnetic transiton around 20 GPa from the paramagnetic (low pressure) to the antiferromagnetic (high pressure) state. Our data indicate a substantial softening of the aggregate sound velocities far below the transition, starting between 5 and 10 GPa. This is consistent with recent radial x-ray diffraction measurements of the elastic constants in FeO. The results indicate that strong magnetoelastic coupling in FeO is the driving force behind the changes in the phonon spectrum of FeO.

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