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Gertenbach J, Sommariva M, Resch C, Narygina O, van Weeren H, Pein A, Filinchuk Y, Smith VJ, Barbour LJ. An in situstudy of host–guest interactions using a laboratory X-ray diffraction system. Acta Crystallogr A 2013. [DOI: 10.1107/s0108767313095561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
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Glazyrin K, Pourovskii LV, Dubrovinsky L, Narygina O, McCammon C, Hewener B, Schünemann V, Wolny J, Muffler K, Chumakov AI, Crichton W, Hanfland M, Prakapenka VB, Tasnádi F, Ekholm M, Aichhorn M, Vildosola V, Ruban AV, Katsnelson MI, Abrikosov IA. Importance of correlation effects in hcp iron revealed by a pressure-induced electronic topological transition. Phys Rev Lett 2013; 110:117206. [PMID: 25166573 DOI: 10.1103/physrevlett.110.117206] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2012] [Indexed: 06/03/2023]
Abstract
We discover that hcp phases of Fe and Fe(0.9)Ni(0.1) undergo an electronic topological transition at pressures of about 40 GPa. This topological change of the Fermi surface manifests itself through anomalous behavior of the Debye sound velocity, c/a lattice parameter ratio, and Mössbauer center shift observed in our experiments. First-principles simulations within the dynamic mean field approach demonstrate that the transition is induced by many-electron effects. It is absent in one-electron calculations and represents a clear signature of correlation effects in hcp Fe.
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Affiliation(s)
- K Glazyrin
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany and Yale University, New Haven, Connecticut 06511, USA
| | - L V Pourovskii
- Swedish e-Science Research Centre (SeRC), Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden and Centre de Physique Théorique, Ecole Polytechnique, CNRS, 91128 Palaiseau Cedex, France
| | - L Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
| | - O Narygina
- School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom
| | - C McCammon
- Bayerisches Geoinstitut, Universität Bayreuth, 95440 Bayreuth, Germany
| | - B Hewener
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - V Schünemann
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - J Wolny
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - K Muffler
- Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany
| | - A I Chumakov
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - W Crichton
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - M Hanfland
- European Synchrotron Radiation Facility (ESRF), F-38043 Grenoble Cedex, France
| | - V B Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - F Tasnádi
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden
| | - M Ekholm
- Swedish e-Science Research Centre (SeRC), Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
| | - M Aichhorn
- Institute of Theoretical and Computational Physics, TU Graz, 8010 Graz, Austria
| | - V Vildosola
- Centro Atómico Constituyentes, GIyANN, CNEA, San Martin, Buenos Aires, Comisión Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina
| | - A V Ruban
- Department of Materials Science and Engineering, Royal Institute of Technology, SE-10044, Stockholm, Sweden
| | - M I Katsnelson
- Radboud University Nijmegen, Institute for Molecules and Materials, 6525 AJ, Nijmegen, Netherlands
| | - I A Abrikosov
- Department of Physics, Chemistry and Biology (IFM), Linköping University, Linköping, Sweden
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Dubrovinsky L, McCammon C, Glazyrin K, Narygina O, Merlini M, Kantor I, Hanfland M, Chumakov A. Interplay between structural and electronic behavior in iron-bearing earth lower mantle minerals. Acta Crystallogr A 2010. [DOI: 10.1107/s0108767310099058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Dubrovinsky L, Glazyrin K, McCammon C, Narygina O, Greenberg E, Ubelhack S, Chumakov AI, Pascarelli S, Prakapenka V, Bock J, Dubrovinskaia N. Portable laser-heating system for diamond anvil cells. J Synchrotron Radiat 2009; 16:737-741. [PMID: 19844007 DOI: 10.1107/s0909049509039065] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Accepted: 09/25/2009] [Indexed: 05/28/2023]
Abstract
The diamond anvil cell (DAC) technique coupled with laser heating has become the most successful method for studying materials in the multimegabar pressure range at high temperatures. However, so far all DAC laser-heating systems have been stationary: they are linked either to certain equipment or to a beamline. Here, a portable laser-heating system for DACs has been developed which can be moved between various analytical facilities, including transfer from in-house to a synchrotron or between synchrotron beamlines. Application of the system is demonstrated in an example of nuclear inelastic scattering measurements of ferropericlase (Mg(0.88)Fe(0.12))O and h.c.p.-Fe(0.9)Ni(0.1) alloy, and X-ray absorption near-edge spectroscopy of (Mg(0.85)Fe(0.15))SiO(3) majorite at high pressures and temperatures. Our results indicate that sound velocities of h.c.p.-Fe(0.9)Ni(0.1) at pressures up to 50 GPa and high temperatures do not follow a linear relation with density.
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Affiliation(s)
- L Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth, Germany.
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Wu X, Steinle-Neumann G, Narygina O, Kantor I, McCammon C, Prakapenka V, Swamy V, Dubrovinsky L. High-pressure behavior of perovskite: FeTiO_{3} dissociation into (Fe_{1-delta},Ti_{delta})O and Fe_{1+delta}Ti_{2-delta}O_{5}. Phys Rev Lett 2009; 103:065503. [PMID: 19792582 DOI: 10.1103/physrevlett.103.065503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2009] [Indexed: 05/28/2023]
Abstract
The stability of perovskite-structured materials at high pressure and temperature is of fundamental interest in solid-state physics, chemistry, and the geosciences. As an alternative to decomposition into oxides or transformation of the CaIrO_{3} postperovskite structure, we observe in situ the breakdown of FeTiO_{3} perovskite into a (Fe_{1-delta},Ti_{delta})O + Fe_{1+delta}Ti_{2-delta}O_{5} assemblage beyond 53 GPa and 2000 K. The high-pressure high-temperature phase of Fe_{1+delta}Ti_{2-delta}O_{5} with a new structure (space group C2/c) could be preserved on decompression to 9 GPa, and amorphizes under further pressure release. Our study demonstrates that perovskite-structured materials can undergo chemical changes and form complex oxides with new structures, rather than only transform to denser polymorphs or decompose to simple oxides.
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Affiliation(s)
- X Wu
- Bayerisches Geoinstitut, Universität Bayreuth, Bayreuth D-95440, Germany
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Dubrovinsky L, Dubrovinskaia N, Narygina O, Kantor I, Kuznetzov A, Prakapenka VB, Vitos L, Johansson B, Mikhaylushkin AS, Simak SI, Abrikosov IA. Body-Centered Cubic Iron-Nickel Alloy in Earth's Core. Science 2007; 316:1880-3. [PMID: 17600212 DOI: 10.1126/science.1142105] [Citation(s) in RCA: 167] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Cosmochemical, geochemical, and geophysical studies provide evidence that Earth's core contains iron with substantial (5 to 15%) amounts of nickel. The iron-nickel alloy Fe(0.9)Ni(0.1) has been studied in situ by means of angle-dispersive x-ray diffraction in internally heated diamond anvil cells (DACs), and its resistance has been measured as a function of pressure and temperature. At pressures above 225 gigapascals and temperatures over 3400 kelvin, Fe(0.9)Ni(0.1) adopts a body-centered cubic structure. Our experimental and theoretical results not only support the interpretation of shockwave data on pure iron as showing a solid-solid phase transition above about 200 gigapascals, but also suggest that iron alloys with geochemically reasonable compositions (that is, with substantial nickel, sulfur, or silicon content) adopt the bcc structure in Earth's inner core.
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Affiliation(s)
- L Dubrovinsky
- Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany
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