Pressure-induced magnetization in FeO: evidence from elasticity and Mössbauer spectroscopy
The complete elastic tensor of Fe0.94O (wüstite) has been determined to 10 GPa using acoustic interferometry at GHz frequencies inside a diamond-anvil cell. The soft mode (C44) elastic constant of FeO is reduced by 20% over the experimental pressure range. An unusual discontinuity in the pressure de...
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| Veröffentlicht in: | Physical review letters 2004-11, Vol.93 (21), p.215502-215502, Article 215502 |
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| container_title | Physical review letters |
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| creator | Kantor, Anastasia P Jacobsen, Steven D Kantor, Innokenty Yu Dubrovinsky, Leonid S McCammon, Catherine A Reichmann, Hans J Goncharenko, Igor N |
| description | The complete elastic tensor of Fe0.94O (wüstite) has been determined to 10 GPa using acoustic interferometry at GHz frequencies inside a diamond-anvil cell. The soft mode (C44) elastic constant of FeO is reduced by 20% over the experimental pressure range. An unusual discontinuity in the pressure derivatives of C11 and C12 at 4.7+/-0.2 GPa corresponds to the pressure at which the onset of a magnetic ordering transition is observed by high-pressure Mössbauer spectroscopy and neutron powder diffraction. Our new results combined with literature structural high P-T data suggest that there is a magnetic, although still cubic, phase of FeO between approximately 5 and approximately 17 GPa. |
| doi_str_mv | 10.1103/physrevlett.93.215502 |
| format | Article |
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The soft mode (C44) elastic constant of FeO is reduced by 20% over the experimental pressure range. An unusual discontinuity in the pressure derivatives of C11 and C12 at 4.7+/-0.2 GPa corresponds to the pressure at which the onset of a magnetic ordering transition is observed by high-pressure Mössbauer spectroscopy and neutron powder diffraction. 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The soft mode (C44) elastic constant of FeO is reduced by 20% over the experimental pressure range. An unusual discontinuity in the pressure derivatives of C11 and C12 at 4.7+/-0.2 GPa corresponds to the pressure at which the onset of a magnetic ordering transition is observed by high-pressure Mössbauer spectroscopy and neutron powder diffraction. Our new results combined with literature structural high P-T data suggest that there is a magnetic, although still cubic, phase of FeO between approximately 5 and approximately 17 GPa.</abstract><cop>United States</cop><pmid>15601026</pmid><doi>10.1103/physrevlett.93.215502</doi><tpages>1</tpages></addata></record> |
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| source | American Physical Society Journals |
| title | Pressure-induced magnetization in FeO: evidence from elasticity and Mössbauer spectroscopy |
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