Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa

Viktor V. Struzhkin; Ho-kwang Mao; Jingzhu Hu; Markus Schwoerer-Böhning; Jinfu Shu; Russell J. Hemley; Wolfgang Sturhahn; Michael Y. Hu; Ercan E. Alp; Peter Eng; Guoyin Shen

doi:10.1103/PhysRevLett.87.255501

Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa

Strongly Correlated Electrons 2009-11-07 v1

Authors: Viktor V. Struzhkin , Ho-kwang Mao , Jingzhu Hu , Markus Schwoerer-Böhning , Jinfu Shu , Russell J. Hemley , Wolfgang Sturhahn , Michael Y. Hu , Ercan E. Alp , Peter Eng , Guoyin Shen

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Abstract

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.

Keywords

nuclear resonant inelastic x-ray scattering FeO magnetic transition phonon spectrum magnetoelastic coupling

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@article{arxiv.cond-mat/0106257,
  title  = {Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa},
  author = {Viktor V. Struzhkin and Ho-kwang Mao and Jingzhu Hu and Markus Schwoerer-Böhning and Jinfu Shu and Russell J. Hemley and Wolfgang Sturhahn and Michael Y. Hu and Ercan E. Alp and Peter Eng and Guoyin Shen},
  journal= {arXiv preprint arXiv:cond-mat/0106257},
  year   = {2009}
}

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4 pages, 4 figures

Nuclear Inelastic X-Ray Scattering of FeO to 48 GPa

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