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Showing 1–7 of 7 results
Advanced filters: Author: R. Rüffer Clear advanced filters

  • In the Earth’s lower mantle, pressure changes can cause spin transitions of iron, in turn influencing mantle properties. Here a new Mössbauer spectroscopy method is applied to show that Fe3+remains in the high-spin state at pressure–temperature conditions relevant for the lower mantle.

    • V. Potapkin
    • C. McCammon
    • L. Dubrovinsky
    Research
    Nature Communications
    Volume: 4, P: 1-6

  • Fe2O3is known to undergo a series of structural, electronic and magnetic transformations at high pressures and temperatures but these are poorly understood due to a lack of structural data. Here, the authors perform experiments to elucidate the transformations and relationships between them.

    • E. Bykova
    • L. Dubrovinsky
    • V. Prakapenka
    ResearchOpen Access
    Nature Communications
    Volume: 7, P: 1-6

  • Earth’s core exhibits similar elastic properties to rubber. Experiments show that a high-pressure phase of iron carbide modifies iron’s elastic properties under inner-core conditions, suggesting that carbon is the light element in the core.

    • C. Prescher
    • L. Dubrovinsky
    • M. Hanfland
    Research
    Nature Geoscience
    Volume: 8, P: 220-223

  • Multiphoton superradiance is observed in a nuclear system excited by an X-ray free-electron laser. Tracking the system decay photon by photon shows strong enhancement of the first photon’s decay rate, in good agreement with Dicke’s formulation.

    • Aleksandr I. Chumakov
    • Alfred Q. R. Baron
    • Tetsuya Ishikawa
    Research
    Nature Physics
    Volume: 14, P: 261-264

  • Synchrotron Mössbauer source spectroscopy is used to reveal that haematite remains magnetic in cold subducting slabs at the depth of the transition zone in the Earth’s mantle, with implications for the locations of magnetic poles during inversions of the Earth’s magnetic field.

    • I. Kupenko
    • G. Aprilis
    • C. Sanchez-Valle
    Research
    Nature
    Volume: 570, P: 102-106

  • Iron has the ability to adopt different electronic configurations, and transitions in its spin state in the lower mantle can significantly influence mantle properties and dynamics. Experimental results for two lower-mantle perovskite compositions show that the intermediate spin state of iron is stable throughout the bulk of the lower mantle.

    • C. McCammon
    • I. Kantor
    • L. Dubrovinsky
    Research
    Nature Geoscience
    Volume: 1, P: 684-687