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Coupled R and Fe magnetic excitations in RFe 3(BO 3) 4 multiferroics / A. M. Kuzmenko [et al.] // Diffusion and Defect Data Pt.B: Solid State Phenomena. - 2012. - Vol. 190. - P. 269-272, DOI 10.4028/www.scientific.net/SSP.190.269 . - ISBN 9783037854365
Кл.слова (ненормированные):
Magnetic resonance -- Rare-earth iron borates -- Terahertz spectroscopy -- Antiferromagnetics -- Coupled mode -- Exchange coupled -- Frequency ranges -- G factors -- Iron borate -- Magnetic excitations -- Multiferroics -- Resonance mode -- Strong interaction -- Transmission spectrums -- Antiferromagnetism -- Electron transitions -- Gadolinium -- Ions -- Magnetic materials -- Magnetic permeability -- Magnetic resonance -- Terahertz spectroscopy -- Neodymium
Аннотация: Various resonance modes were observed in the transmission spectra of rare-earth iron borates RFe 3(BO 3) 4 (R = Nd 3+, Sm 3+, Gd 3+) at the frequency range 100-600 GHz, which were attributed to collective magnetic excitations in the exchange coupled Fe- and R-subsystems, i.e. antiferromagnetic (Fe) resonance and electron transitions in the R-ions. Strong interaction of the Fe and R oscillations was revealed and theoretically analyzed taking into account feature of the R-ion ground state. Intensities of the coupled modes (contributions to magnetic permeability) strongly depend on a difference of Fe and R ions g-factors that allows defining the sign of the latter. In particular, an appreciable intensity of exchange (Nd) modes in NdFe 3(BO 3) 4 is caused by g Nd?,|| < 0 whereas in GdFe 3(BO 3) 4 with gGd ? gFe ? 2 the exchange (Gd) modes were hided due to compensation of Fe and Gd contributions. In SmFe 3(BO 3) 4, despite a negligible Sm g-factor, the Sm modes were clear observed due to their excitation via coupling with the Fe-subsystem. В© (2012) Trans Tech Publications.

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Доп.точки доступа:
Kuzmenko, A. M.; Кузьменко А.М.; Mukhin, A. A.; Ivanov, V.Yu.; Bezmaternykh, L. N.; Безматерных, Леонард Николаевич; Moscow International Symposium on Magnetism(5 ; 2011 ; Aug. ; 21-25 ; Moscow)
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Effect of magnetic frustrations on magnetism of the Fe3BO5 and Co3BO5 ludwigites / Y. V. Knyazev [et al.] // J. Magn. Magn. Mater. - 2019. - Vol. 474. - P. 493-500, DOI 10.1016/j.jmmm.2018.10.126. - Cited References: 33. - The Russian Foundation for Basic Research, Russia (project no. 17-02-00826-a ). S.G.O. thanks the Russian Academy of Science , Russia (project no. 0356-2017-0030 ) for financial support. J.B. and A.A. acknowledge the financial support of the Spanish MINECO-MAT2017-83468R project, Aragonese E-12 17R RASMIA (co-funded by Fondo Social Europeo), and the European Union (FEDER (ES)). . - ISSN 0304-8853
Кл.слова (ненормированные):
Antiferromagnetics -- Superexchange interactions -- Frustrations
Аннотация: The magnetic structures of Fe3BO5 and Co3BO5 ludwigites have been studied experimentally by magnetic measurements and theoretically by the combination of the group theoretical analysis and semi empiric calculations of the superexchange interactions. The different collinear spin configurations in the triads 3-1-3 and 4-2-4 including ferromagnetic, antiferromagnetic and dimer have been considered. For Fe3BO5 the antiferromagnetic state with zero magnetic moment per unit cell, showing the lowest energy, results to be the most probable magnetic ground state. The unusual magnetic structure comprising two virtually independent orthogonal subsystems is formed to avoid heavy frustrations of superexchange interactions between the 3-1-3 and 4-2-4 spin ladders. In Co3BO5 the magnetic frustrations present for the Co3+ high-spin state are quenched for a Co3+ low spin state resulting in the ferrimagnetic long-range order. The obtained results are discussed in comparison with experimental magnetic data.

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Держатели документа:
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, 660036, Russian Federation
Siberian State University of Science and Technologies, Krasnoyarsk, 660014, Russian Federation
Instituto de Ciencia de Materiales de Aragon, CSIC-Universidad de Zaragoza and Departamento de Fisica de la Materia Condensada, Zaragoza, 50009, Spain
Servicio de Medidas Fisicas, Universidad de Zaragoza, Pedro Cerbuna 12, Zaragoza, 50009, Spain

Доп.точки доступа:
Knyazev, Yu. V.; Князев, Юрий Владимирович; Kazak, N. V.; Казак, Наталья Валерьевна; Nazarenko, I. I.; Назаренко, Илья Иванович; Sofronova, S. N.; Софронова, Светлана Николаевна; Rostovtsev, N. D.; Bartolome, J.; Arauzo, A.; Ovchinnikov, S. G.; Овчинников, Сергей Геннадьевич
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Val'kov, V. V.
Effect of pressure on antiferromagnetic and superconducting ordering in systems with heavy fermions / V. V. Val'kov, A. O. Zlotnikov // Bull. Russ. Acad. Sci.: Phys. - 2012. - Vol. 76, Is. 7. - P. 733-736, DOI 10.3103/S1062873812070362. - Cited References: 7. - This work was supported by the Department of Physical Sciences, Russian Academy of Sciences (the Strong Electron Correlations Program); the Russian Foundation for Basic Research, projects nos. 100200251 and 110200741; the RFBR Sibir’, project no. 110298007; and by the federal target program Scientific and Pedagogical Personnel of an Innovative Russia, 2009–2013. . - ISSN 0022-2860
Кл.слова (ненормированные):
Antiferromagnetic orderings -- Antiferromagnetic orders -- Antiferromagnetic phasis -- Antiferromagnetics -- Cooper instability -- Effect of pressure -- External pressures -- Heavy fermion -- Impurity level -- Localized state -- Periodic Anderson model -- Seed energy -- Spin moments -- Superconducting ordering -- Superexchange interaction -- Superconductivity -- Antiferromagnetism
Аннотация: Characteristics of the superconducting and antiferromagnetic phases of heavy-fermion intermet-allides are described within a periodic Anderson model with allowance for the superexchange interaction between spin moments of the localized states. It is shown that an external pressure that changes the seed energy of an impurity level can rapidly destroy the long-range antiferromagnetic order. The development of the Cooper instability near such an order-disorder transition induces the experimentally observed state in which superconductivity coexists with the antiferromagnetic ordering. В© 2012 Allerton Press, Inc.

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Публикация на русском языке Вальков, Валерий Владимирович. Влияние давления на антиферромагнитное и сверхпроводящее упорядочение в системах с тяжелыми фермионами [Текст] / В. В. Вальков, A. O. Злотников // Изв. РАН. Сер. физич. - 2012. - Т. 76 № 7. - С. 821-824

Доп.точки доступа:
Zlotnikov, A. O.; Злотников, Антон Олегович; Вальков, Валерий Владимирович; International Interdisciplinary Symposium “Ordering in Minerals and Alloys” (14th ; 8 -13 Sept. 2011 ; Rostov-on-Don)
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Val'kov, V. V.
Electron spectrum and heat capacity of heavy fermions in the canted phase of antiferromagnetic intermetallides / V. V. Val'kov, D. M. Dzebisashvili // J. Exp. Theor. Phys. - 2010. - Vol. 110, Is. 2. - P. 301-318, DOI 10.1134/S1063776110020147. - Cited References: 41. - This study was supported by the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences, interdisciplinary integration project no. 53 of the Siberian Branch of the Russian Academy of Sciences, and the Russian Foundation for Basic Research (project no. 07-02-00226). . - ISSN 1063-7761

РУБ Physics, Multidisciplinary
Рубрики:
PERIODIC ANDERSON MODEL
   PRESSURE-INDUCED SUPERCONDUCTIVITY
   KONDO-LATTICE
   FERROMAGNETISM
   FLUCTUATIONS
   COEXISTENCE
   CERHIN5
   SYSTEMS
   DIAGRAM
   CENISN
Кл.слова (ненормированные):
Antiferromagnetic phase -- Antiferromagnetics -- Antiferromagnets -- Electron spectrum -- Electronic heat capacity -- Energy spectra -- Experimental data -- External magnetic field -- Heat capacities -- Heavy fermion -- Low temperatures -- Magnetic sublattices -- Magnetic subsystems -- Sommerfeld constant -- Structural rearrangement -- Temperature dependence -- Antiferromagnetism -- Cerium -- Cerium compounds -- Fermions -- Magnetic fields -- Phase transitions -- Specific heat -- Spectroscopy -- Antiferromagnetic materials
Аннотация: The energy spectrum of heavy fermions in an external magnetic field is calculated for canted magnetic sublattices of antiferromagnetic intermetallides. This makes it possible to determine low-temperature features of electronic heat capacity of heavy-fermion antiferromagnets with the metal-type ground state taking into account the structural rearrangement of the magnetic subsystem. The calculated temperature dependences of the magnetization, heat capacity, and Sommerfeld constant in the vicinity of the point of transition to the antiferromagnetic phase correlate with experimental data obtained for heavy-fermion antiferromagnets PuGa3, Ce2Au2Cd, YbNiSi3, and PuPd5Al2.

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Публикация на русском языке Электронный спектр и теплоемкость тяжелых фермионов в скошенной фазе антиферромагнитных интерметаллидов [Текст] / В. В. Вальков, Д. М. Дзебисашвили // Журнал экспериментальной и теоретической физики. - Москва : Федеральное государственное унитарное предприятие "Академический научно-издательский, производственно-полиграфический и книгораспространительский центр Российской академии наук "Издательство "Наука", 2010. - Т. 137 № 2. - С. 341-360

Держатели документа:
[Val'kov, V. V.
Dzebisashvili, D. M.] Russian Acad Sci, Siberian Branch, Inst Phys, Krasnoyarsk 660036, Russia
[Val'kov, V. V.
Dzebisashvili, D. M.] Siberian Fed Univ, Krasnoyarsk 660075, Russia
[Val'kov, V. V.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
ИФ СО РАН
Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk 660075, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
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Gekht, R. S.
Helicoidal magnetic structure in frustrated antiferromagnetics / R. S. Gekht, A. M. Epikhin, V. I. Ponomarev // Fiz. Tverd. Tela. - 1995. - Vol. 37, Is. 6. - P. 1891-1893. - Cited References: 6 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
QUANTUM FLUCTUATIONS
PHASE-TRANSITIONS

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Доп.точки доступа:
Epikhin, A. M.; Ponomarev, V. I.
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Inclined magnetic structures and magnetic phase diagrams for the Pb2Fe2−xMnxGe2O9 (x = 0.16) single crystal / A. I. Pankrats, A. D. Balaev, S. A. Skorobogatov [et al.] // J. Magn. Magn. Mater. - 2022. - Vol. 563. - Ст. 170021, DOI 10.1016/j.jmmm.2022.170021. - Cited References: 24. - This study was supported by the Russian Foundation for Basic Research, the Government of the Krasnoyarsk Territory, and the Krasnoyarsk Territorial Foundation for Support of Scientific and R&D Activities, project no. 20-42-2 40006 “Synthesis and Study of Pb 2+ and Bi 3+ -Containing Oxide Single Crystals with Partial Substitution in One of the Subsystems: Magnetic Structures and Magnetodielectric Effect”. The SEM and EDS studies were carried out at the Joint Scientific Center of the Siberian Federal University within the state assignment (#FSRZ-2020-0011) of the Ministry of Science and Higher Education of the Russian Federation . - ISSN 0304-8853
Кл.слова (ненормированные):
Antiferromagnetics -- Antiferromagnets -- Applied magnetic fields -- Field change -- Magnetic phase diagrams -- Specific heat measurement -- Spins reorientation transition -- Structures phase -- Synthesised
Аннотация: Single crystals of the Pb2Fe2?xMnxGe2O9 (x = 0.16) antiferromagnet have been grown. Using the specific heat measurements, a Neel temperature of TN = (42.0 ± 0.5) K for the synthesized crystals has been found. It has been shown using the magnetic measurements that, due to the competition between the magnetoanisotropic contributions of the iron and manganese subsystems in the crystals, near a temperature of Tc = 22 K, a spontaneous spin-reorientation transition occurs, the temperature of which in an applied magnetic field changes with the field value and orientation relative to the rhombic axes of the crystal. Based on the analysis of the temperature and field dependences of the magnetization obtained at different orientations of the magnetic field, it has been established that, below Tc, an inclined magnetic structure is formed in the crystal. The antiferromagnetic vector of the inclined structure rotates smoothly in the rhombic bc plane with increasing temperature from a direction close to the b axis at T = 4.2 K and tends to the rhombic c axis at T = Tc. The rotation of the antiferromagnetic vector occurs also at fixed temperatures T < Tc with increasing magnetic field. In the temperature range of Tc < T < TN, the antiferromagnetic vector is oriented along the rhombic c axis. Magnetic phase diagrams of states have been built for different magnetic field orientations relative to the rhombic axes of the crystal. The richest phase diagram is shown to correspond to the orientation H||c and contains, along with the above-listed states, one more inclined phase, in which the antiferromagnetic vector rotates toward the rhombic a axis direction with a change in temperature or magnetic field.

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Держатели документа:
Kirensky Institute of Physics, Krasnoyarsk Scientific Center, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, 660041, Russian Federation
Petersburg Nuclear Physics Institute, National Research Center “Kurchatov Institute”, Gatchina, 188300, Russian Federation

Доп.точки доступа:
Pankrats, A. I.; Панкрац, Анатолий Иванович; Balaev, A. D.; Балаев, Александр Дмитриевич; Skorobogatov, S. A.; Скоробогатов, Станислав Алексеевич; Krasikov, A. A.; Красиков, Александр Александрович; Kolkov, M. I.; Колков, Максим Игоревич; Zharkov, S. M.; Жарков, Сергей Михайлович; Zeer, G. M.; Pavlovskii, M. S.; Павловский, Максим Сергеевич; Balaev, D. A.; Балаев, Дмитрий Александрович
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Magnetic structure in iron borates RFe3(BO3)(4) (R = Er, Pr): a neutron diffraction and magnetization study / C. . Ritter [et al.] // J. Phys.: Condens. Matter. - 2010. - Vol. 22, Is. 20. - Ст. 206002, DOI 10.1088/0953-8984/22/20/206002. - Cited References: 22. - This work was supported by RFBR, grant no. 10-02-00765, and by the Physical Sciences Department of RAS, project no. 1.1.1.1. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
GDFE3(BO3)(4)
DYFE3(BO3)(4)
CRYSTAL
Кл.слова (ненормированные):
Antiferromagnetics -- Crystallographic structure -- Iron borate -- Low temperatures -- Magnetic ordering -- Magnetic propagation -- Magnetization measurements -- Rare-earth sublattices -- Space Groups -- Spin reorientation -- Sub-lattices -- Temperature range -- Unit cells -- Anisotropy -- Antiferromagnetic materials -- Antiferromagnetism -- Erbium -- Erbium compounds -- Magnetic devices -- Magnetic properties -- Magnetic structure -- Magnetization -- Neutron diffraction -- Rare earths -- Single crystals -- Crystallography
Аннотация: Neutron diffraction, susceptibility and magnetization measurements (for R = Er only) were performed on iron borates RFe3(BO3)(4) (R = Pr, Er) to investigate details of the crystallographic structure, the low temperature magnetic structures and transitions and to study the role of the rare earth anisotropy. PrFe3(BO3)(4), which crystallizes in the spacegroup R32, becomes antiferromagnetic at T-N = 32 K, with t = [0 0 3/2], while ErFe3(BO3)(4), which keeps the P3(1)21 symmetry over the whole studied temperature range 1.5 K < T < 520 K, becomes antiferromagnetic below T-N = 40 K, with tau = [0 0 1/2]. Both magnetic propagation vectors lead to a doubling of the crystallographic unit cell in the c-direction. Due to the strong polarization of the Fe-sublattice, the magnetic ordering of the rare earth sublattices appears simultaneously at T-N. The moment directions are determined by the rare earth anisotropy: easy-axis along c for PrFe3(BO3)(4) and easy-plane a-b for ErFe3(BO3)(4). There are no spin reorientations present in either of the two compounds but there is the appearance below 10 K of a minority phase in the Er-compound adopting a 120 degrees arrangement of the Er-moments.

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Держатели документа:
[Ritter, C.] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France
[Vorotynov, A.
Pankrats, A.
Petrakovskii, G.
Temerov, V.
Gudim, I.] RAS, Siberian Branch, LV Kirenskii Inst Phys, Krasnoyarsk 660036, Russia
[Petrakovskii, G.] Siberian Fed Univ, Krasnoyarsk, Russia
[Szymczak, R.] Inst Phys PAS, Warsaw, Poland
ИФ СО РАН
Institut Laue-Langevin, Boite Postale 156, F-38042 Grenoble, France
L v Kirenskii Institute of Physics, Siberian Branch of RAS, Krasnoyarsk 660036, Russian Federation
Siberian Federal University, Krasnoyarsk, Russian Federation
Institute of Physics PAS, Warsaw, Poland

Доп.точки доступа:
Ritter, C.; Vorotynov, A. M.; Воротынов, Александр Михайлович; Pankrats, A. I.; Панкрац, Анатолий Иванович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Temerov, V. L.; Темеров, Владислав Леонидович; Gudim, I. A.; Гудим, Ирина Анатольевна; Szymczak, R.
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Magnetic structure of iron borate DyFe3(BO3)4: A neutron diffraction study / C. Ritter [et al.] // J. Phys.: Conf. Ser. - 2012. - Vol. 340. - Ст. 012065, DOI 10.1088/1742-6596/340/1/012065. - Cited References: 22 . - ISSN 1742-6588

РУБ Physics, Condensed Matter + Physics, Particles & Fields

Кл.слова (ненормированные):
Antiferromagnetics -- Crystallographic structure -- Easy-axis anisotropy -- Iron borate -- Kramers doublet -- Low temperatures -- Magnetic propagation -- Neutron diffraction measurements -- Repopulation -- Room temperature -- Spin reorientation -- Sub-lattices -- Thermal dependences -- Unit cells
Аннотация: Neutron diffraction measurements were performed on the iron borate DyFe3(BO3)4 to investigate details of the crystallographic structure, the low temperature magnetic structure and its magnetic properties. DyFe3(BO3)4 adopts at room temperature the P3121 symmetry and becomes antiferromagnetic below TN = 39 K. Both, the rare earth and the iron sublattice, follow the same magnetic propagation vector τ = [0, 0, ½] which leads to a doubling of the crystallographic unit cell in the c-direction. The easy axis anisotropy of the rare earth determines the moment orientation to be mainly along c. No spin reorientation is found between TN and 1.5 K, however, a small anomaly in the thermal dependence of the unit cell a-parameter is found at about 27 K which could be connected to repopulation of low lying Kramers doublets of Dy3+. The magnetic moment value of the Fe-moment is at 1.5 K with μFe = 4.5 μB only slightly smaller than expected for an S = 5/2 ion while the Dy moment is strongly reduced and amounts only to μDy = 6.4 μB.

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Доп.точки доступа:
Ritter, C.; Pankrats, A. I.; Панкрац, Анатолий Иванович; Gudim, I. A.; Гудим, Ирина Анатольевна; Vorotynov, A. M.; Воротынов, Александр Михайлович; European Conference on Neutron Scattering(5 ; 2011 ; Jul. 17- 21 ; Prague, Czech Republic)
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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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10.

APLESNIN, S. S.
MAGNETIC-PROPERTIES OF ANTIFERROMAGNETICS WITH FLUCTUATIONALLY INTERACTING PLANES / S. S. APLESNIN // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 8. - P. 2105-2109. - Cited References: 5 . - ISSN 0367-3294

РУБ Physics, Condensed Matter

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