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    Antiferromagnetic dichroism in a complex multisublattice magnetoelectric CuB2O4 / K. N. Boldyrev [et al.] // Phys. Rev. Lett. - 2015. - Vol. 114, Is. 24. - Ст. 247210, DOI 10.1103/PhysRevLett.114.247210. - Cited References:40. - This study was supported by the Russian Academy of Sciences under the Programs for Basic Research, by the President of the Russian Federation (Grant No. MK-3521.2015.2, K. N. B.), by the Russian Foundation for Basic Research (Grants No. 15-32-20613, K. N. B., and No. 15-02-04222, R. V. P.), and by the Ministry of Education and Science of the Russian Federation (Grant No. 14.B25.0031.25, R. V. P.). . - ISSN 0031. - ISSN 1079-7114
   Перевод заглавия: Антиферромагнитный дихроизм в сложном многоподрешеточном магнетоэлектрике CuB2O4

РУБ Physics, Multidisciplinary
Рубрики:
MAGNETIC SOLITON LATTICE
   COPPER METABORATE
   GYROTROPIC BIREFRINGENCE
   SPECTROSCOPY
   EXCITATIONS
   TRANSITIONS
   CRYSTALS
   Cr2O3
   FIELD
Аннотация: Magnetic control of the crystal chirality was announced by Saito et al. [Phys. Rev. Lett. 101, (2008)] on the ground of experiments in CuB2O4. This claim has raised a sharp dispute in the literature because it seemed to contradict the fundamental symmetry principles. We settle this dispute on the basis of a high-resolution optical spectroscopy study of excitonic transitions in CuB2O4. We find that a large sublattice-sensitive antiferromagnetic linear dichroism (LD) emerges at the Néel temperature TN=21 K and show how it could simulate a “magnetic-field control of the crystal chirality.” We prove that the discovered LD is related microscopically to the magnetic Davydov splitting. This LD is highly sensitive to subtle changes in the spin subsystems, which allowed us to observe a splitting of the phase transition into an incommensurate magnetic phase into two transitions (T∗1=8.5 and T∗2=7.9 K) and to suggest elliptical spiral structures below T∗1, instead of a simple circular helix proposed earlier.
О магнитном контроле кристаллической хиральности сообщил Сайто и др. [Phys. Rev. Lett. 101, 117402 (2008)] на основании экспериментов в CuB2O4. Это требование вызвало резкий спор в литературе, потому что это казалось, противоречат основным принципам симметрии. Мы урегулировать этот спор на основе исследования с помощью оптической спектроскопии высокого разрешения экситонных переходов в CuB2O4. Мы считаем, что большой подрешетко-чувствительный антиферромагнитный линейный дихроизм (LD) возникает при температуре Нееля TN= 21 Kи показываем, как это может имитировать "контроль магнитным полем кристаллической хиральности." Мы докажем, что обнаруженный LD связанс микроскопическим магнитным Давыдовским расщеплением. Этот Л.Д. весьма чувствителен к тонким изменениям в спиновых подсистем, которые позволили нам наблюдать расщепление фазового перехода в несоизмеримы магнитная фаза в двух переходов (T*1= 8,5 и Т*2 = 7,9 К) и предположить эллиптическую спиральную структуру ниже T*1, вместо простой круговой спирали предложенный ранее.

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Держатели документа:
RAS, Inst Spect, Moscow 142190, Russia.
RAS, Ioffe Phys Tech Inst, St Petersburg 194021, Russia.
RAS, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.

Доп.точки доступа:
Boldyrev, K. N.; Pisarev, R. V.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Popova, M. N.; Russian Academy of Sciences under the Programs for Basic Research; Russian Federation [MK-3521.2015.2]; Russian Foundation for Basic Research [15-32-20613, 15-02-04222]; Ministry of Education and Science of the Russian Federation [14.B25.0031.25]
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Large directional optical anisotropy in multiferroic ferroborate / A. M. Kuzmenko [et al.] // Phys. Rev. B. - 2015. - Vol. 92, Is. 18. - Ст. 184409, DOI 10.1103/PhysRevB.92.184409. - Cited References: 44. - This work was supported by the Russian Foundation for Basic Research (14-02-91000, 15-02-07647, 14-02-00307, 13-02-12442, 15-42-04186), Sci. school-924.2014.2, and by the Austrian Science Fund (I815-N16, I1648-N27, W1243) . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
DICHROISM
   BIREFRINGENCE
   RFe3(BO3)4
   POLARIZATION
   EXCITATIONS
   RESONANCE
   Cr2O3
Аннотация: One of the most fascinating and counterintuitive recent effects in multiferroics is directional anisotropy, the asymmetry of light propagation with respect to the direction of propagation. In such case the absorption in a material can be different for opposite directions. Besides absorption, different velocities of light for different directions of propagation may be also expected, which is termed directional birefringence. In this work, we demonstrate large directional anisotropy in multiferroic samarium ferroborate. The effect is observed for linear polarization of light in the range of millimeter wavelengths, and it survives down to low frequencies. The dispersion and absorption close to the electromagnon resonance can be controlled by external magnetic field and are fully suppressed in one direction. By changing the geometry of the external field, samarium ferroborate shows giant optical activity, which makes this material a universal tool for optical control: with a magnetic field as an external parameter it allows switching between two functionalities: polarization rotation and directional anisotropy.

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Держатели документа:
Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, Russian Federation
Institute of Solid State Physics, Vienna University of Technology, Vienna, Austria
L. V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk, Russian Federation

Доп.точки доступа:
Kuzmenko, A. M.; Dziom, V.; Shuvaev, A.; Pimenov, A.; Schiebl, M.; Mukhin, A. A.; Ivanov, V. Y.; Gudim, I. A.; Гудим, Ирина Анатольевна; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич
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Magnetic, structural, and dielectric properties of CuB(2)O(4) / G. . Nenert [et al.] // Phys. Rev. B. - 2007. - Vol. 76, Is. 14. - Ст. 144401, DOI 10.1103/PhysRevB.76.144401. - Cited References: 30 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
WEAK FERROMAGNETISM
   COPPER METABORATE
   MAGNETOELECTRIC PHENOMENA
   BAMNF4
   CR2O3
   ANTIFERROMAGNETICS
   CONSTANT
Аннотация: We have studied the magnetic, structural, and dielectric properties of a single crystal of CuB(2)O(4). We show that both reported magnetic transitions are observable in the magnetization, irrespective of the measured direction of the crystal. This is in agreement with recent neutron data. More importantly, our study demonstrates the absence of dielectric anomalies at the various magnetic transitions despite the reported magnetoelectric symmetry. This demonstrates that the polarization remains zero at any temperature. Consequently, we interpret our data as the evidence for a very weak or the absence of linear magnetoelectric coupling in this material.

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Держатели документа:
[Nenert, G.
Palstra, T. T. M.] Univ Groningen, Zernike Inst Adv Mat, Solid State Chem Lab, NL-9747 AG Groningen, Netherlands
[Bezmaternykh, L. N.] LV Kirenskii Inst Phys, Siberian Branch RAS, Krasnoyarsk 660036, Russia
[Vasiliev, A. N.] Moscow MV Lomonosov State Univ, Loe Temp Phys Dept, Moscow 119991, Russia
ИФ СО РАН
Solid State Chemistry Laboratory, Zernike Institute for Advanced Materials, University of Groningen, Nijenborg 4, 9747 AG Groningen, Netherlands
L. V. Kirensky Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Low Temperature Physics Department, Moscow State University, Moscow 119991, Russian Federation
CEA-Grenoble DRFMC/SPSMS/MDN, 17 rue des Martyrs, 38054 Grenoble Cedex, France

Доп.точки доступа:
Nenert, G.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Vasiliev, A. N.; Palstra, TTM
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Magnetic-field induced second harmonic generation in CuB2O4 / R. V. Pisarev [et al.] // Phys. Rev. Lett. - 2004. - Vol. 93, Is. 3. - Ст. 37204, DOI 10.1103/PhysRevLett.93.037204. - Cited References: 28 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
COPPER METABORATE
PHASE
CR2O3
Кл.слова (ненормированные):
Antiferromagnetic materials -- Crystal structure -- Energy gap -- Magnetic moments -- Magnetization -- Monochromators -- Nonlinear optics -- Paramagnetism -- Phase diagrams -- Polarization -- Second harmonic generation -- Single crystals -- Electric-field induced second harmonic (EFISH) -- Magnetic structure -- Magnetic-field induced second harmonic (MFISH) -- Phonon transitions -- Copper compounds
Аннотация: Three types of optical magnetic-field induced second harmonic (MFISH) generation are observed in CuB2O4. Unusually sharp and intense electronic transitions in MFISH and linear absorption spectra provide selective access to the two nonequivalent Cu2+ sublattices. The magnetic phase diagram for both sublattices is determined by MFISH. Magnetic structure is dominated by antiferromagnetic order at the 4b site. Sublattice interactions transfer it to the 8d site where it coexists with a discoupled paramagnetic component.

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Держатели документа:
Max Born Inst, D-12489 Berlin, Germany
Russian Acad Sci, Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Dortmund, Inst Phys, D-44221 Dortmund, Germany
Russian Acad Sci, Ioffe Phys Tech Inst, St Petersburg 194021, Russia
ИФ СО РАН
Ioffe Physical Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russian Federation
Institut Fur Physik, Universitat Dortmund, 44221 Dortmund, Germany
Siberian Branch, Russian Academy of Sciences, Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Max-Born-Institut, Max-Born-Stra?e 2A, 12489 Berlin, Germany

Доп.точки доступа:
Pisarev, R. V.; Sanger, I.; Petrakovskii, G. A.; Петраковский, Герман Антонович; Fiebig, M.
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