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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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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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