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Uniaxial magnetic anisotropy in Co2.25Fe0.75O2BO3 compared to Co3O2BO3 and Fe3O2BO ludwigites / J. . Bartolome [et al.] // Phys. Rev. B. - 2011. - Vol. 83, Is. 14. - Ст. 144426, DOI 10.1103/PhysRevB.83.144426. - Cited References: 25. - The authors acknowledge V. V. Rudenko for the oxyborate samples they made and O. A. Bayukov for fruitful discussion. The financial support of Spanish MINCYT, Grant No. MAT08/1077, and the Aragonese E-34 project are acknowledged. Fruitful discussions with F. Bartolome and P. Bordet are acknowledged. The latter is thanked for providing the FeINF3/INFOINF2/INFBOINF3/INF single crystal. Also this study was supported by the Russian Foundation for Basic Research (Project No. 09-02-00171-a), the Federal Agency for Science and Innovation (Rosnauka) (Project No. MK-5632.2010.2), and the Physical Division of the Russian Academy of Science (Program "Strongly Correlated Electrons," Project No. 2.3.1). . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
MOSSBAUER
CO3BO5
Аннотация: Magnetic and Mossbauer spectroscopy (MS) measurements have been performed on a single crystal of Co2.25Fe0.75O2BO3 with ludwigite structure. Two magnetic transitions (T-N = 115 K and T-C = 70 K) were traced from the ac susceptibility temperature dependence. The MS spectra as a function of temperature clearly show the onset of magnetic ordering below 115 K. Magnetization measurements on the parent Co3O2BO3 and Fe3O2BO3 compounds have been done for comparison. In Fe3O2BO3 the anisotropy of the different phases has been determined, showing that the anisotropy axis changes from the a to the b axis in the low-temperature antiferromagnetic phase. High magnetic uniaxial anisotropy has been detected for both Co3O2BO3 and Co2.25Fe0.75O2BO3. From the angle-dependent magnetization measurements it is found that in both compounds the easy axis of magnetization is the b [010] axis, where an antiferromagnetic component is superimposed on the main ferromagnetic component. In the c direction the behavior is purely antiferromagnetic. In Co2.25Fe0.75O2BO3 a strong reduction of the remanent magnetization and a very strong increase in coercive field along the b axis with respect to those found in Co3O2BO3 were observed from magnetic hysteresis cycles measured below T-C. The increase of coercive field is caused by the increase of defects upon Co substitution by Fe.

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Держатели документа:
[Bartolome, J.] Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
[Bartolome, J.] Univ Zaragoza, CSIC, Dept Fis Mat Condensada, E-50009 Zaragoza, Spain
[Arauzo, A.] Univ Zaragoza, Serv Instrumentac Cientif, Area Medidas Fis, E-50009 Zaragoza, Spain
[Kazak, N. V.
Ovchinnikov, S. G.] RAS, SB, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
[Ivanova, N. B.
Knyazev, Yu. V.] Siberian Fed Univ, Krasnoyarsk 660074, Russia
[Ivanova, N. B.] Krasnoyarsk State Agrarian Univ, Krasnoyarsk, Russia
[Ovchinnikov, S. G.] Siberian State Aerosp Univ, Krasnoyarsk, Russia
[Lyubutin, I. S.] RAS, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
ИФ СО РАН
Instituto de Ciencia de Materiales de Aragon, Departamento de Fisica de la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
Servicio de Instrumentacion Cientifica, Area de Medidas Fisicas, Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain
L.V. Kirensky Institute of Physics, SB of RAS, 660036, Akademgorodok, Krasnoyarsk, Russian Federation
Siberian Federal University, Kirensky street 26, 660074, Krasnoyarsk, Russian Federation
Krasnoyarsk State Agrarian University, Mira street 90, Krasnoyarsk, Russian Federation
Siberian State Aerospace University, Krasnoyarskiy Rabochiy street 31, Krasnoyarsk, Russian Federation
Shubnikov Institute of Crystallography, RAS, Leninskiy prospect 59, 119333, Moscow, Russian Federation

Доп.точки доступа:
Bartolome, J.; Arauzo, A.; Kazak, N. V.; Казак, Наталья Валерьевна; Ivanova, N. B.; Иванова, Наталья Борисовна; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Lyubutin, I. S.
}
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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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The magnetic P-T phase diagram of langasite Ba3TaFe 3Si2O14 at high hydrostatic pressures up to 38 GPa / A. G. Gavriliuk [et al.] // Applied Physics Letters. - 2013. - Vol. 103, Is. 16. - Ст. 162402. - P. , DOI 10.1063/1.4822422 . - ISSN 0003-6951
Аннотация: The langasite-type crystals with 3d ions are considered as a class of multiferroics in which ferroelectricity can be induced by the magnetic ordering. In this paper, the high-pressure magnetic states of the langasite-type powdered sample Ba3TaFe3Si2O14 have been investigated in a diamond anvil cell by the nuclear forward scattering of synchrotron radiation technique at different temperatures in hydrostatic conditions. In the pressure range of 0 < P < 19.5 GPa, an increase of the Neel temperature TN from 27 to 41 K was observed in the antiferromagnetic phase of the material. At pressures ?19.5 GPa, a transition to another magnetic phase with huge increase in the Neel temperature to ?120 K was found. We attribute this change to the structural transition at ?19.5 GPa which is evidenced by a drastic change of Raman spectra at this pressure. A tentative magnetic P-T phase diagram of Ba3TaFe 3Si2O14 is proposed. В© 2013 AIP Publishing LLC.

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Держатели документа:
Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA
Russian Acad Sci, Inst Crystallog, Moscow 119333, Russia
Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660041, Russia
Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA

Доп.точки доступа:
Gavriliuk, A. G.; Lyubutin, I. S.; Starchikov, S. S.; Mironovich, A. A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Trojan, I. A.; Xiao, Yuming; Chow, P.; Sinogeikin, S. V.; Struzhkin, V. V.
}
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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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Structure of Gd0.95Bi0.05Fe3(BO3)4single crystals at 293 and 90 K / E. S. Smirnova [et al.] // Crystallogr. Rep. - 2016. - Vol. 61, Is. 4. - P. 558-565, DOI 10.1134/S1063774516040192. - Cited References: 27. - This study was performed using the equipment of the Center of Collective Use of the Shubnikov Institute of Crystallography of the Russian Academy of Sciences and it was supported by the Ministry of Education and Science of the Russian Federation (Project RFMEFI62114X0005) and in part by the Russian Foundation for Basic Research (Grant nos. 14-02-00483 and 14-02-00307) and the Federal Program on Support of Leading Scientific Schools (Grant no. NSh-6617.2016.5). . - ISSN 1063-7745

РУБ Crystallography
Рубрики:
TRIGONAL GdFe3(BO3)4
PHASE-TRANSITIONS
IRON
Аннотация: The structure of GdFe3(BO3)4 single crystals has been studied by X-ray diffraction at 293 and 90 K. The crystals are grown from a flux in the Bi2Mo3O12–B2O3–Li2MoO4–Gd2O3–Fe2O3 system. The results of chemical analysis and structural study show that these crystals contain bismuth as an impurity. It is found that bismuth atoms are located at gadolinium sites in the structure. A decrease in the temperature is accompanied by a lowering of the symmetry from sp. gr. R32 (at 293 K) to sp. gr. P3121 (at 90 K). The presence of two types of iron chains with different geometries at 90 K promotes a change in the magnetic properties of these crystals with a decrease in the temperature. © 2016, Pleiades Publishing, Inc.

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Публикация на русском языке Строение монокристаллов Gd0.95Bi0.05Fe3(BO3)4 при температурах 293 и 90 K [Текст] / Е. С. Смирнова [и др.] // Кристаллография. - Москва : Наука, 2016. - Т. 61 № 4. - С. 535-542

Держатели документа:
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow, Russian Federation
Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Akademgorodok 50, str. 38, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Smirnova, E. S.; Alekseeva, O. A.; Dudka, A. P.; Verin, I. A.; Artemov, V. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Gudim, I. A.; Гудим, Ирина Анатольевна; Frolov, K. V.; Lyubutin, I. S.
}
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Structural peculiarities of bismuth-containing RFe3(BO3)4 (R = Ho, Y, Sm, Nd) / E. Smirnova, O. Alekseeva, A. Dudka [et al.] // Acta Crystallogr. A. - 2021. - Vol. 77, Supplement. - P. C1237-C1237, DOI 10.1107/S0108767321084749. - Cited References: 4. - This work was performed using the equipment of the Shared Research Center FSRC 'Crystallography and Photonics' RAS and was supported by the Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS . - ISSN 2053-2733

РУБ Chemistry, Multidisciplinary + Crystallography

Кл.слова (ненормированные):
phase transition -- single crystals -- multiferroics -- rare-earth iron borates -- X-ray structure analysis -- EDS spectroscopy -- Mossbauer spectroscopy -- characteristic temperatures

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Держатели документа:
FSRC Crystallog & Photon RAS, Leninskiy Prospekt 59, Moscow 119333, Russia.
RAS, Kirensky Inst Phys, Siberian Branch, Akad Gorodok 50, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Smirnova, E.; Alekseeva, O. A.; Dudka, A. P.; Verin, I. A.; Artemov, V. V.; Артемов Владимир В.; Khmelenin, D. N.; Gudim, I. A.; Гудим, Ирина Анатольевна; Frolov, K. V.; Lyubutin, I. S.; Ministry of Science and Higher Education within the State assignment FSRC 'Crystallography and Photonics' RAS; Congress of the International Union of Crystallography(25 ; 14-22 August 2021 ; Prague, Czech Republic)
}
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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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Strongly correlated systems with spin-crossover effects [Текст] / V. V. Struzhkin [и др.] // V Euro-Asian simposium "Trend in MAGnetism": Nanomagnetism. [[b]]EASTMAG – 2013[[/b]] : abstracts. - Vladivostok : FEFU, 2013. - P113 . - ISBN 978-5-7444-3124-2

Держатели документа:
Аргоннская национальная лаборатория, США
Институт Карнеги, Географическая лаборатория (Вашингтон, США)
Институт ядерных исследований РАН

Доп.точки доступа:
Struzhkin, V. V.; Стружкин В.В.; Jung-Ho Kim; Джанг-Хо Ким; Shvydko, Yuri; Швыдко, Юрий; Gavriliuk, A. G.; Гаврилюк А.Г.; Lyubutin, I. S.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Euro-Asian Symposium "Trends in MAGnetism": Nanomagnetism(5 ; 2013 ; Sept. ; 15-21 ; Vladivostok)
}
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Spin-glass behavior of warwickite MgFeBO4 and CoFeBO4 crystals observed by Mössbauer spectroscopy / I. S. Lyubutin [et al.] // J. Alloys Compd. - 2015. - Vol. 642. - P. 204-209, DOI 10.1016/j.jallcom.2015.04.067. - Cited References:29. - This study was supported by the Russian Foundation for Basic Research (Grants # 14-02-00483a, 14-02-31051-mol-a, 13-02-00958- a, and 13-02-00358-a), by the Council for Grants of the President of the Russian Federation (Project Nos. NSh-2886.2014.2 and SP-938.2015.5), by the Grant of KSAI, Krasnoyarsk regional fund of supporting scientific and technological activities and by the program of Foundation for Promotion of Small Enterprises in Science and Technology (''UMNIK'' program). The Spanish MINECO project MAT2011/23791, MAT2014/53921 and DGA E-34 are acknowledged. . - ISSN 0925. - ISSN 1873-4669. -

РУБ Chemistry, Physical + Materials Science, Multidisciplinary + Metallurgy & Metallurgical Engineering
Рубрики:
SOLVABLE MODEL
SPECTRA
Кл.слова (ненормированные):
Warwickites -- Spin-glass -- Mossbauer spectroscopy
Аннотация: Single crystals of MgFeBO4 and СоFeBO4 warwickites were obtained. The effects of charge ordering and magnetic properties were investigated by Mössbauer spectroscopy. Cation distribution over M1 and M2 nonequivalent sites and the average charge at the metal positions were established. Low temperature Mössbauer spectra reveal spin-glass behavior, with spin-freezing temperatures TSG of 15.2 and 33.2 K for Mg- and Co-warwickites, respectively, higher than that observed from the d.c. and a.c. magnetic susceptibility measurements. The difference is explained in terms of dynamical scaling theory. The specific shape of the Mössbauer spectra in the vicinity of the magnetic transition at TSG shows the difference between spin-glass and superparamagnetic behavior and demonstrates an overwhelming role of the exchange anisotropy in the properties of Mg-warwickite. In Co-warwickite the increase of magnetocrystalline anisotropy provokes an increase in magnetic viscosity.
Были получены монокристаллы MgFeBO4 и CoFeBO4 warwickites. Эффекты упорядочения зарядов и магнитные свойства были исследованы методом мессбауэровской спектроскопии. Было определено распределение катионов на М1 и M2 неэквивалентных позициях и средний заряд на металлических позициях. При низкой температуре Мессбауэровские спектры показывают поведение типа спинового стекла, с температурой замораживания спинов TSG 15.2 и 33.2 K для MG-и Co-warwickites, соответственно, более высокие, чем наблюдалось от постоянного тока и на ~ измерениях магнитной восприимчивости. Разница объясняется в терминах динамической теории подобия. Удельный форма спектров Мессбауэра в непосредственной близости от магнитного перехода на TSG показывает разницу между спин-стекольным и суперпарамагнитным поведением и демонстрирует подавляющее роль обменной анизотропии в свойствах Mg-warwickite. В Co-warwickite увеличение магнитокристаллической анизотропия провоцирует увеличение магнитной вязкости.

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Держатели документа:
RAS, AV Shubnikov Crystallog Inst, Moscow 119333, Russia
SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Zaragoza, Serv Medidas Fis, E-50009 Zaragoza, Spain
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
Dept Fis Mat Condensada, Zaragoza 50009, Spain

Доп.точки доступа:
Lyubutin, I. S.; Korotkov, N. Yu.; Frolov, K. V.; Kazak, N. V.; Казак, Наталья Валерьевна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Arauzo, A.; Bartolome, J.
}
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10.

    Spin-glass behavior in single crystals of hetero-metallic magnetic warwickites MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 / A. Arauzo [et al.] // J. Magn. Magn. Mater. - 2015. - Vol. 392. - P. 114-125, DOI 10.1016/j.jmmm.2015.05.006. - Cited References:36. - This work has been financed by the MINECO Project MAT11/23791, MAT2014-53921-R and DGA IMANA project E-34, Russian Foundation for Basic Research (project Nr. 13-02-00958, 13-02-00358 and 14-02-31051-mol-a), Council for Grants of the President of the Russian Federation (project Nr. NSh-2886.2014.2 and SP-938.2015.5). The work of one of coauthors (M.S.P.) was supported by the program of Foundation for Promotion of Small Enterprises in Science and Technology ("UMNIK" program). . - ISSN 0304-8853. - ISSN 1873-4766
   Перевод заглавия: Спин-стекольное поведение в монокристаллах гетерометаллических магнитных варвикитов MgFeBO4, Mg0.5Co0.5FeBO4 и CoFeBO4

РУБ Materials Science, Multidisciplinary + Physics, Condensed Matter
Рубрики:
SYSTEMS
   CHAIN
   Fe
   SUSCEPTIBILITY
   Fe2OBO3
   ENERGY
Кл.слова (ненормированные):
Warwickites -- Spin glass -- Entanglement -- Exchange interaction
Аннотация: Magnetic properties of heterometallic warwickites MgFeBO4, Mg0.5Co0.5FeBO4, and CoFeBO4 are presented, highlighting the effect of Co substitution on the magnetic properties of these compounds. The analysis of magnetization and heat capacity data has shown that these compounds exhibit a spin-glass transition below TSG=10, 20 and 22 K, respectively. Using zero field ac susceptibility as entanglement witness we find that the low dimensional magnetic behavior above TSG show quantum entanglement behavior χ(Τ)∝T−α(Τ) up to TE≈130 K. The α parameters have been deduced as a function of temperature and Co content, indicating the existence of random singlet phase in this temperature region. Above TE the paramagnetism is interpreted in terms of non-entangled spins giving rise to Curie–Weiss paramagnetism. The different intra- and inter-ribbon exchange interaction pathways have been calculated within a simple indirect coupling model. It is determined that the triangular motifs in the warwickite structure, together with the competing interactions, induce frustration. The spin-glass character is explained in terms of the substitutional disorder of the Mg, Fe and Co atoms at the two available crystallographic sites, and the frustration induced by the competing interactions. The Co substitution induces uniaxial anisotropy, increases the absolute magnetization and increases the spin-glass freezing temperature. The entanglement behavior is supported in the intermediate phase irrespective of the introduction of anisotropy by the Co substitution.
Представлены магнитные свойства гетерометаллических варвикитов MgFeBO4, Mg0.5Co0.5FeBO4 и CoFeBO4, с выделением эффекта замещения Co на магнитные свойства этих соединений. Анализ данных намагниченности и теплоемкости показал, что эти соединения обладают спин-стекольным переходом ниже TSG=10, 20 и 22 К соответственно. Используя нулевого поля для переменной восприимчивости, мы находим, что низкоразмерных магнитное поведение выше TSG показать квантовая запутанность поведение χ (Τ) αT? α (Τ) до TEE130 К. Параметры α были выведены в зависимости от температуры и содержание Со, что указывает на существование случайного синглетного фазы в этой области температур. Над TE в Парамагнетизм интерпретируется в терминах перепутывания спинов, приводящих к парамагнетизму Кюри-Вейсса. Различные внутри- и обменного взаимодействия между направлениями были рассчитаны в модели простой косвенной связи. Установлено, что треугольные мотивы в структуре варвикита, вместе с конкурирующими взаимодействиями, вызывают фрустрацию. Характер спинового стекла объясняется в условиях беспорядка замещения атомов Mg, Fe и Co в двух доступных кристаллографических позициях, и фрустрацию, индуцированную конкурирующими взаимодействиями. Замена Со вызывает одноосную анизотропию, увеличивает абсолютную намагниченность и повышает температуру замерзания спинового стекла. Запутанность Поведения поддерживается в промежуточной фазе, независимо от анизотропии из-за введения замещения Со.

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Держатели документа:
Univ Zaragoza, Serv Med Fis, Zaragoza 50009, Spain
LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
Siberian Fed Univ, Krasnoyarsk 660074, Russia
RAS, Shubnikov Inst Crystallog, Moscow 119333, Russia
Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Zaragoza 50009, Spain
Dept Fis Mat Condensada, Zaragoza 50009, Spain

Доп.точки доступа:
Arauzo, A.; Kazak, N. V.; Казак, Наталья Валерьевна; Ivanova, N. B.; Иванова, Наталья Борисовна; Platunov, M. S.; Платунов, Михаил Сергеевич; Knyazev, Yu. V.; Князев, Юрий Владимирович; Bayukov, O. A.; Баюков, Олег Артемьевич; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Lyubutin, I. S.; Frolov, K. V.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич; Bartolome, J.; MINECO Project [MAT11/23791, MAT2014-53921-R]; DGA IMANA project [E-34]; Russian Foundation for Basic Research [13-02-00958, 13-02-00358, 14-02-31051-mol-a]; Council for Grants of the President of the Russian Federation [NSh-2886.2014.2, SP-938.2015.5]; program of Foundation for Promotion of Small Enterprises in Science and Technology ("UMNIK" program)
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