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Structural and electronic transitions in gadolinium iron borate GdFe3(BO3)(4) at high pressures / A. G. Gavriliuk [et al.] // JETP Letters. - 2004. - Vol. 80, Is. 6. - P. 426-432, DOI 10.1134/1.1830662. - Cited References: 20 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
TRIGONAL GDFE3(BO3)(4)
   RM(3)(BO3)(4) CRYSTALS
   OPTICAL-SPECTRA
   BAND-STRUCTURE
   FEBO3
   GROWTH
Аннотация: The optical properties and structure of gadolinium iron borate GdFe3(BO3)(4) crystals are studied at high pressures produced in diamond-anvil cells. X-ray diffraction data obtained at a pressure of 25.6 GPa reveal a first-order phase transition retaining the trigonal symmetry and increasing the unit cell volume by 8%. The equation of state is obtained and the compressibility of the crystal is estimated before and after the phase transition. The optical spectra reveal two electronic transitions at pressures similar to26 GPa and similar to43 GPa. Upon the first transition, the optical gap decreases jumpwise from 3.1 to similar to2.25 eV. Upon the second transition at P = 43 GPa, the optical gap deceases down to similar to0.7 eV, demonstrating a dielectric-semiconductor transition. By using the theoretical model developed for a FeBO3 crystal and taking into account some structural analogs of these materials, the anomalies of the high-pressure optical spectra are explained. (C) 2004 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Moscow Region, Russia
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Siberian Div, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Max Planck Inst Chem, D-55020 Mainz, Germany
ИФ СО РАН

Доп.точки доступа:
Gavriliuk, A. G.; Kharlamova, S. A.; Lyubutin, I. S.; Troyan, I. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluiko, A. M.; Eremets, M. I.; Boehler, R.
}
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The mechanism of suppression of strong electron correlations in FeBO3 at high pressures / A. G. Gavriliuk [et al.] // J. Exp. Theor. Phys. - 2004. - Vol. 99, Is. 3. - P. 566-573, DOI 10.1134/1.1809686. - Cited References: 18 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC COLLAPSE
   TRANSITION
   SPECTRA
   ABSORPTION
   STATE
Кл.слова (ненормированные):
Crystal structure -- High pressure effects -- Light absorption -- Parameter estimation -- Phase transitions -- Spectrum analysis -- Crystal field -- Electron correlations -- Generalized tight binding method -- Hybridization -- Iron compounds
Аннотация: The optical absorption spectra of iron borate (FeBO3) are measured at high pressures up to P = 82 GPa. A mechanism of suppression of strong electron correlations is proposed within the framework of the generalized tight binding method, which leads to the experimentally observed magnetic, electronic, and structural phase transitions. Taking into account peculiarities of the crystal structure of FeBO3 and the strong s-p hybridization of boron and oxygen, it is established that, as the distance between ions varies with increasing pressure, the crystal field parameter begins to play a decisive role in the electron transitions, while the influence of the d band broadening is negligibly small. Parameters of the theory are calculated as functions of the pressure. (C) 2004 MAIK "Nauka / Interperiodica".

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Держатели документа:
Russian Acad Sci, Shubnikov Inst Crystall, Moscow, Russia
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142092, Russia
Russian Acad Sci, Kirensky Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russian Federation
Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142092, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Trojan, I. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyubutin, I. S.; Sarkisyan, V. A.
}
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Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy / O. A. Bayukov [et al.] // Physica B. - 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P. 1321-1323, DOI 10.1016/j.physb.2005.01.397. - Cited References: 3 . - ISSN 0921-4526

РУБ Physics, Condensed Matter

Кл.слова (ненормированные):
strongly correlated electron system -- antiferromagnets -- borates -- Antiferromagnets -- Borates -- Strongly correlated electron system -- Antiferromagnetism -- Cryostats -- Energy gap -- Magnetic moments -- Magnetic properties -- Mossbauer spectroscopy -- Optical properties -- Single crystals -- Borates -- Coulomb correlations -- Liquid helium -- Strongly correlated electron systems -- Gadolinium compounds
Аннотация: Magnetic and optical properties of GdFe3-xGax(BO3)(4) single crystals are investigated by Mossbauer and optical spectroscopy. The GdFe3(BO3)(4) multielectron band structure model is derived. A high- and low-spin crossover of Fe3+ ion, a collapse of the magnetic moment, the suppression of Coulomb correlations, and insulator-semiconductor transition are predicted. The jump of an energy gap is measured at pressure 43 GPa. (c) 2005 Elsevier B.V. All rights reserved.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk, Russia
Inst High Pressure Phys, Troitsk 142190, Russia
Inst Crystallog, Moscow 117333, Russia
Univ Liverpool, Liverpool L69 3BX, Merseyside, England
ИФ СО РАН
LV Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation
Institute of High Pressure Physics, 142190, Troisk, Moscow region, Russian Federation
Institute of Crystallograhy, Leninsky Av. 59, 117333, Moscow, Russian Federation
The University of Liverpool, Liverpool L69 3BX, United Kingdom

Доп.точки доступа:
Bayukov, O. A.; Баюков, Олег Артемьевич; Gavrilyuk, A. M.; Zabluda, V. N.; Заблуда, Владимир Николаевич; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluyko, A. M.; Tomas, M.; Trojan, I. A.; Kharlamova, S. A.
}
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Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures / A. G. Gavriliuk [et al.] // J. Phys.: Condens. Matter. - 2005. - Vol. 17: 2nd International Symposium on Physics of Solids Under High Presure Using Nuclear Probes (JUL 22-25, 2004, Cologne, GERMANY), Is. 48. - P. 7599-7604, DOI 10.1088/0953-8984/17/48/011. - Cited References: 8 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
Кл.слова (ненормированные):
Band structure -- Coulomb blockade -- High pressure effects -- Iron compounds -- Magnetic moments -- Mathematical models -- Optical properties -- Relaxation processes -- Coulomb correlations -- Electron correlations -- Insulator-semiconductor transitions -- Optical transitions -- Gadolinium compounds
Аннотация: The optical properties of GdFe3(BO3)(4) under high pressures have been investigated experimentally and theoretically, and the results are compared with the properties of FeBO3. A model of the GdFe3(BO3)(4) band structure is derived within the multielectron model taking into account the strong electron correlations. Crossover of the Fe3+ ion high-spin and low-spin states, collapse of the magnetic moment, the relaxation Coulomb correlations, and insulator-semiconductor transition are predicted. Optical transitions in GdFe3(BO3)(4) and FeBO3 under high pressures were discovered.

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Держатели документа:
RAS, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
RAS, Inst Crystallog, Moscow 119333, Russia
RAS, Inst High Pressure Phys, Troitsk 142190, Russia
ИФ СО РАН
Institute of Crystallography, RAS, 119333, Moscow, Russian Federation
Institute for High Pressure Physics, RAS, 142190, Troitsk, Russian Federation
L V Kirensky Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Kharlamova, S. A.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Potseluyko, A. M.; Trojan, I. A.; Zabluda, V. N.; Заблуда, Владимир Николаевич
}
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High-pressure magnetic properties and P-T phase diagram of iron borate / A. G. Gavriliuk [et al.] // J. Exp. Theor. Phys. - 2005. - Vol. 100, Is. 4. - P. 688-696, DOI 10.1134/1.1926429. - Cited References: 24 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
FEBO3 SINGLE-CRYSTALS
   NUCLEAR-RESONANCE
   BAND-STRUCTURE
   TRANSITION
   TEMPERATURE
   SCATTERING
Кл.слова (ненормированные):
Antiferromagnetic materials -- Diamonds -- Ferromagnetic materials -- High pressure effects -- Low temperature effects -- Magnetic moments -- Magnetic properties -- Magnetization -- Phase diagrams -- Powders -- Single crystals -- Synchrotron radiation -- Diamond anvil cells -- Electronic transition -- Iron borate -- Nuclear forward scattering (NFS) -- Iron compounds
Аннотация: The high-pressure magnetic states of iron borate (FeBO3)-Fe-57 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 Neel 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 3d(5) (S = 5/2, (6)A(1g)) to the low-spin (S = 1/2, T-2(2g)) 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. © 2005 Pleiades Publishing, Inc.

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Держатели документа:
Inst High Pressure Phys, Troitsk 142190, Moscow Oblast, Russia
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Siberian Div, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
ИФ СО РАН
Institute for High-Pressure Physics, Troitsk, Moscow oblast, 142190, Russian Federation
Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333, Russian Federation
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Trojan, I. A.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Sarkissian, V. A.
}
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Spin reorientation effects in GdFe3(BO3)(4) induced by applied field and temperature / S. A. Kharlamova [et al.] // J. Exp. Theor. Phys. - 2005. - Vol. 101, Is. 6. - P. 1098-1105, DOI 10.1134/1.2163925. - Cited References: 14 . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
RM(3)(BO3)(4) CRYSTALS
GROWTH
Кл.слова (ненормированные):
Antiferromagnetism -- Ground state -- Magnetic moments -- Magnetic properties -- Mossbauer spectroscopy -- Single crystals -- Temperature distribution -- Spin orientation -- Static magnetic measurements -- Gadolinium compounds
Аннотация: Magnetic properties of GdFe3(BO3)(4) single crystals were investigated by Fe-57-Mossbauer spectroscopy and static magnetic measurements. In the ground state, the GdFe3(BO3)(4) crystal is an easy-axis compensated antiferromagnet, but the easy axis of iron moments does not coincide with the crystal C-3 axis, deviating from it by about 20 degrees. The spontaneous and field-induced spin reorientation effects were observed and studied in detail. The specific directions of iron magnetic moments were determined for different temperatures and applied fields. Large values of the angle between the Fe3+ magnetic moments and the C-3 axis in the easy-axis phase and between Fe3+ moments and the a(2) axis in the easy-plane phase reveal the tilted antiferromagnetic structure. (c) 2005 Pleiades Publishing, Inc.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Liverpool, Liverpool L69 3BX, Merseyside, England
Inst Crystallog, Moscow 119333, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
University of Liverpool, L69 3BX, Liverpool, United Kingdom
Institute of Crystallography, Moscow, 119333, Russian Federation

Доп.точки доступа:
Kharlamova, S. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Balaev, A. D.; Балаев, Александр Дмитриевич; Thomas, M. F.; Lyubutin, I. S.; Gavriliuk, A. G.
}
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Pressure-induced electron spin transition in the paramagnetic phase of the GdFe3(BO3)(4) Heisenberg magnet / I. S. Lyubutin [et al.] // JETP Letters. - 2006. - Vol. 84, Is. 9. - P. 518-523, DOI 10.1134/S0021364006210119. - Cited References: 26 . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
TRIGONAL GDFE3(BO3)(4)
   NUCLEAR
   FEBO3
   STATE
   SCATTERING
   COLLAPSE
Аннотация: The HS - LS spin crossover effect (high-spin - low-spin transition) induced by high pressure in the range 45-53 GPa is observed in trivalent Fe3+ ions in the paramagnetic phase of a (GdFe3)-Fe-57(BO3)(4) gadolinium iron borate crystal. This effect is studied in high-pressure diamond-anvil cells by two experimental methods using synchrotron radiation: nuclear resonant forward scattering (NFS) and Fe K-beta high-resolution x-ray emission spectroscopy (YES). The manifestation of the crossover in the paramagnetic phase, which has no order parameter to distinguish between the HS and LS states, correlates with the optical-gap jump and with the insulator-semiconductor transition in the crystal. Based on a theoretical many-electron model, an explanation of this effect at high pressures is proposed.

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Держатели документа:
Russian Acad Sci, Shubnikov Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
Russian Acad Sci, Siberian Div, Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Argonne Natl Lab, Argonne, IL 60439 USA
ИФ СО РАН
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 119333, Russian Federation
Institute of High-Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russian Federation
Geophysical Laboratory, Carnegie Institution of Washington, Washington, DC 20015, United States
Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Advanced Photon Source, ANL, Argonne, IL 60439, United States

Доп.точки доступа:
Lyubutin, I. S.; Gavriliuk, A. G.; Struzhkin, V. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Kharlamova, S. A.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Hu, M.; Chow, P.
}
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Magnetic order in FeCr2S4-type chalcogenide spinels / F. J. Berry [et al.] // J. Phys.: Condens. Matter. - 2007. - Vol. 19, Is. 26. - Ст. 266204, DOI 10.1088/0953-8984/19/26/266204. - Cited References: 15 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
COLOSSAL-MAGNETORESISTANCE
TRANSITION
Кл.слова (ненормированные):
Doping (additives) -- Iron compounds -- Magnetization -- Magnetoresistance -- Mossbauer spectroscopy -- X ray absorption fine structure spectroscopy -- Chalcogenide spinels -- Low temperature magnetic behaviour -- Magnetic ordering temperature -- Thiospinels -- Chalcogenides
Аннотация: The thiospinels of composition FeCr2S4 and Fe1+xCr2-2xSnxS4 with 0 < x < 0.1 have been examined by means of extended x- ray absorption fine structure, Mossbauer spectroscopy and magnetoresistance techniques. The structural characterization shows that tin enters the spinel- related lattice as Sn4+ and occupies the octahedral B site. Appreciable magnetoresistance is observed in the temperature range 160 - 185 K which includes the magnetic ordering temperature. The effect of slight non- stoichiometry in FeCr2S4 and of tin doping is observed in the M r ossbauer spectra which show the Fe2+ ions to occupy the tetrahedral A sites. The M r ossbauer spectra recorded around the magnetic ordering temperature are sensitive to small ( 0.03 T) applied magnetic fields. The influence of tin on the low temperature magnetic behaviour is associated with the distribution of Cr3+, Sn4+ and Fe3+ ions around tetrahedral Fe2+ sites and vacancies in the anionic sublattice. An interpretation of the colossal magnetoresistance phenomena below TN is suggested.

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Держатели документа:
Open Univ, Dept Chem, Milton Keynes MK7 6AA, Bucks, England
Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
Univ Liverpool, Dept Phys, Liverpool L69 3BX, Merseyside, England
Russian Acad Sci, Inst Inorgan & Gen Chem, Moscow 119907, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
Department of Chemistry, Open University, Walton Hall, Milton Keynes MK7 6AA, United Kingdom
A V Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninsky avenue 59, Moscow 119333, Russian Federation
Department of Physics, University of Liverpool, Liverpool L69 3BX, United Kingdom
Institute of Inorganic and General Chemistry, Russian Academy of Sciences, Leninsky avenue 31, Moscow 119907, Russian Federation
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation

Доп.точки доступа:
Berry, F. J.; Dmitrieva, T. V.; Ovanesyan, N. S.; Lyubutin, I. S.; Thomas, M. F.; Sarkisyan, V. A.; Ren, X.; Aminov, T. G.; Shabunina, G. G.; Rudenko, V.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Dubinskaya, Y. L.
}
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Another mechanism for the insulator-metal transition observed in Mott insulators / A. G. Gavriliuk [et al.] // Phys. Rev. B. - 2008. - Vol. 77, Is. 15. - Ст. 155112, DOI 10.1103/PhysRevB.77.155112. - Cited References: 26 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
ELECTRONIC-STRUCTURE
   SPIN TRANSITION
   HIGH-PRESSURES
   GDFE3(BO3)(4)
Аннотация: The two widely accepted mechanisms of the insulator-metal Mott-Hubbard transitions which have been considered up until now are driven by the band-filling or bandwidth effects. We found a different mechanism of the Mott-Hubbard insulator-metal transition, which is controlled instead by the changes in the Mott-Hubbard energy U. In contrast to the changes in the bandwidth W in the "bandwidth control" scenario or to the variations of the band-filling n parameter in the "band-filling" scenario, a dramatic decrease in the Mott-Hubbard energy U plays the key role in this mechanism. We have experimentally observed this type of the insulator metal transition in the transition metal oxide BiFeO(3). The decrease in the Mott-Hubbard energy is caused by the high-spin-low-spin crossover in the electronic d shell of 3d transition metal ion Fe(3+) with d(5) configuration under high pressure. The pressure-induced spin crossover in BiFeO(3) was investigated and confirmed by synchrotron x-ray diffraction, nuclear forward scattering, and x-ray emission methods. The insulator-metal transition at the same pressures was found by the optical absorption and dc resistivity measurements.

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Держатели документа:
[Gavriliuk, Alexander G.
Struzhkin, Viktor V.] Carnegie Inst Washington, Geophys Lab, Washington, DC 20015 USA
[Gavriliuk, Alexander G.
Lyubutin, Igor S.] Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
[Gavriliuk, Alexander G.] RAS, Inst High Pressure Phys, Moscow 142190, Russia
[Ovchinnikov, Sergey G.] Russian Acad Sci, Siberian Div, Inst Phys, Krasnoyarsk 660036, Russia
[Ovchinnikov, Sergey G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Hu, Michael Y.
Chow, Paul] HPCAT, Argonne, IL 60439 USA
[Hu, Michael Y.
Chow, Paul] ANL, APS, Carnegie Inst Washington, Argonne, IL 60439 USA
ИФ СО РАН
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, United States
Institute of Crystallography, Russian Academy of Sciences, Leninsky Prospekt 59, Moscow 119333, Russian Federation
Institute for High Pressure Physics, RAS, Troitsk, 142190, Russian Federation
Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
HPCAT, Carnegie Institution of Washington, APS, Argonne, IL 60439, United States

Доп.точки доступа:
Gavriliuk, A. G.; Struzhkin, V. V.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Hu, M. Y.; Chow, P.
}
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10.

Electronic Transitions in the VBO3 Single Crystal at High Pressures / A. G. Gavriliuk [et al.] // JETP Letters. - 2008. - Vol. 88, Is. 11. - P. 762-766, DOI 10.1134/S0021364008230136. - Cited References: 19. - We are grateful to V.V. Rudenko for the samples provided for this study and to I.S. Edelman for discussions of the results. This work was supported by the Russian Foundation for Basic Research (project nos. 07-02-00490a, 08-02-00897a, and 08-02-90708mob_st); by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (project no. MK-4278.2008.2); and by the Division of Physical Sciences, Russian Academy of Sciences (program "Strongly Correlated Electrons"). . - ISSN 0021-3640

РУБ Physics, Multidisciplinary
Рубрики:
FEBO3
Кл.слова (ненормированные):
74.62.Fj -- 75.50.-y -- 78.70.En -- 81.40.Rs
Аннотация: Optical absorption spectra of single crystals of the ferromagnetic semiconductor VBO3 are studied at high pressures up to 70 GPa achieved in a diamond-anvil cell. An electronic transition accompanied by sharp changes in the optical parameters and a decrease in the optical gap from E-0 = 3.02 eV to 2.25 eV is found at the pressure P-C = 30 GPa. The gap does not disappear in the high-pressure phase and its value becomes typical of semiconductors. This is indicative of a semiconductor-semiconductor transition. The transition to the metallic state may occur at the critical pressure P-met similar to 290 GPa.

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Держатели документа:
[Gavriliuk, A. G.
Lyubutin, I. S.] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
[Gavriliuk, A. G.] Russian Acad Sci, Inst High Pressure Phys, Troitsk 142190, Moscow Region, Russia
[Kazak, N. V.
Ovchinnikov, S. G.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
ИФ СО РАН
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, 119333, Russian Federation
Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow region, 142190, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation

Доп.точки доступа:
Gavriliuk, A. G.; Kazak, N. V.; Казак, Наталья Валерьевна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Lyubutin, I. S.
}
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