High-pressure magnetic properties and P-T phase diagram of iron borate

  • A. G. Gavriliuk
  • I. A. Trojan
  • I. S. Lyubutin
  • S. G. Ovchinnikov
  • V. A. Sarkissian
Order, Disorder, and Phase Transitions in Condensed Systems


The high-pressure magnetic states of iron borate 57FeBO3 single-crystal and powder samples have been investigated in diamond anvil cells by nuclear forward scattering (NFS) of synchrotron radiation at different temperatures. In the low-pressure (0 < P < 46 GPa) antiferromagnetic phase, an increase of the Neél temperature from 350 to 595 K induced by pressure was found. At pressures 46–49 GPa, a transition from the antiferromagnetic to a new magnetic state with a weak magnetic moment (magnetic collapse) was discovered. It is attributed to the electronic transition in Fe3+ ions from the high-spin 3d5 (S = 5/2, 6A1g) to the low-spin (S = 1/2, 2T2g) state (spin crossover) due to the insulator-semiconductor-type transition with extensive suppression of strong d-d electron correlations. At low temperatures, NFS spectra of the high-pressure phase indicate magnetic correlations in the low-spin system with a magnetic ordering temperature of about 50 K. A tentative magnetic P-T phase diagram of FeBO3 is proposed. An important feature of this diagram is the presence of two triple points where magnetic and paramagnetic phases of the high-spin and low-spin states coexist.


Phase Diagram Magnetic State Electronic Transition Synchrotron Radiation Triple Point 
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© Pleiades Publishing, Inc. 2005

Authors and Affiliations

  • A. G. Gavriliuk
    • 1
    • 2
  • I. A. Trojan
    • 1
  • I. S. Lyubutin
    • 2
  • S. G. Ovchinnikov
    • 3
  • V. A. Sarkissian
    • 2
  1. 1.Institute for High-Pressure PhysicsTroitsk, Moscow oblastRussia
  2. 2.Institute of CrystallographyRussian Academy of SciencesMoscowRussia
  3. 3.Kirensky Institute of Physics, Siberian DivisionRussian Academy of SciencesKrasnoyarskRussia

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