Quantum critical point and spin fluctuations in lower-mantle ferropericlase

Описание

Тип публикации: статья из журнала

Год издания: 2013

Идентификатор DOI: 10.1073/pnas.1304827110

Ключевые слова: diamond anvil cell, synchrotron radiation, Mott insulator, spin crossover, Diamond anvil cell, Mott insulator, Spin crossover, Synchrotron radiation, ferropericlase, ferrous ion, iron, iron derivative, unclassified drug, acceleration, article, calculation, controlled study, electronics, low temperature, magnetism, Mossbauer spectroscopy, physical chemistry, priority journal, quantum mechanics, synchrotron Mossbauer spectroscopy, theoretical model, transmission electron microscopy

Аннотация: Ferropericlase [(Mg,Fe)O] is one of the most abundant minerals of the earth's lower mantle. The high-spin (HS) to low-spin (LS) transition in the Fe2+ ions may dramatically alter the physical and chemical properties of (Mg,Fe) O in the deep mantle. To understand the effects of compression on the ground electronic state of iron, eleПоказать полностьюctronic and magnetic states of Fe2+ in (Mg0.75Fe0.25)O have been investigated using transmission and synchrotron Mossbauer spectroscopy at high pressures and low temperatures (down to 5 K). Our results show that the ground electronic state of Fe2+ at the critical pressure P-c of the spin transition close to T = 0 is governed by a quantum critical point (T = 0, P = P-c) at which the energy required for the fluctuation between HS and LS states is zero. Analysis of the data gives P-c = 55 GPa. Thermal excitation within the HS or LS states (T > 0 K) is expected to strongly influence the magnetic as well as physical properties of ferropericlase. Multielectron theoretical calculations show that the existence of the quantum critical point at temperatures approaching zero affects not only physical properties of ferropericlase at low temperatures but also its properties at P-T of the earth's lower mantle.

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Издание

Журнал: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA

Выпуск журнала: Vol. 110, Is. 18

Номера страниц: 7142-7147

ISSN журнала: 00278424

Место издания: WASHINGTON

Издатель: NATL ACAD SCIENCES

Авторы

  • Lyubutin I.S. (Institute of Crystallography,Russian Academy of Sciences)
  • Chow P. (High Pressure Collaborative Access Team,Geophysical Laboratory,Carnegie Institution of Washington)
  • Xiao Y. (High Pressure Collaborative Access Team,Geophysical Laboratory,Carnegie Institution of Washington)
  • Gavriliuk A.G. (Institute for Nuclear Research,Russian Academy of Sciences)
  • Naumov P.G. (Institute of Crystallography,Russian Academy of Sciences)
  • Struzhkin V.V. (Geophysical Laboratory,Carnegie Institution of Washington)
  • Hemley R.J. (Geophysical Laboratory,Carnegie Institution of Washington)
  • Mironovich A.A. (Institute for Nuclear Research,Russian Academy of Sciences)
  • Lin J.F. (Department of Geological Sciences,Jackson School of Geosciences,University of Texas at Austin)
  • Ovchinnikov S.G. (Siberian Federal University)
  • Sinogeikin S. (High Pressure Collaborative Access Team,Geophysical Laboratory,Carnegie Institution of Washington)

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