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Каталог книг и брошюр библиотеки ИФ СО РАН
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1.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: SANDALOV I. S., RICHTER M.
Заглавие
: FLUX PHASE, NEEL
ANTIFERROMAGNETISM
, AND SUPERCONDUCTIVITY IN THE T-J MODEL
Разночтения заглавия
:авие SCOPUS: Flux phase, Neel
antiferromagnetism
, and superconductivity in the t-J model
Место публикации
: Phys. Rev. B: AMERICAN PHYSICAL SOC, 1994. - Vol. 50, Is. 17. - P12855-12865. - ISSN 0163-1829,
DOI
10.1103/PhysRevB.50.12855
Примечания
: Cited References: 27
Предметные рубрики:
HUBBARD-MODEL
INSTABILITY
ELECTRONS
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2.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: OVCHINNIKOV S.G.
Заглавие
: THE INFLUENCE OF THE
ANTIFERROMAGNETISM
ON THE ELECTRONIC-STRUCTURE OF LA2CUO4
Разночтения заглавия
:авие SCOPUS: The influence of the
antiferromagnetism
on the electronic structure of La2CuO4
Место публикации
: J. Supercond.: PLENUM PUBL CORP, 1995. - Vol. 8: University-of-Miami Workshop on High-Temperature Superconductivity - Physical Properties and Mechanisms (JAN 05-11, 1995, CORAL GABLES, FL), Is. 5. - P675-676. - ISSN 0896-1107,
DOI
10.1007/BF00727473
Примечания
: Cited References: 15
Предметные рубрики:
OXIDES
MODEL
Ключевые слова
(''Своб.индексиров.''): electron correlations--electron structure--spin fluctuations--electron correlations--electron structure--spin fluctuations--
antiferromagnetism
--band structure--calculations--correlation theory--electrons--lanthanum compounds--paramagnetism--perturbation techniques--antiferromagnetic phase--electron correlations--intercluster interactions--spin fluctuations--electronic structure
Аннотация:
The quasiparticle approach for electronic structure calculations considering strong electron correlations is given. The exact diagonalization of a multiband Hubbard Hamiltonian for a small cluster is combined with perturbation theory for intercluster hopping. The band structure of paramagnetic and antiferromagnetic La2CuO4 are discussed.
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3.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Roessli B., Schefer J., Petrakovskii G. A., Ouladdiaf B., Boehm M., Staub U., Vorotinov A. M., Bezmaternikh L. N.
Заглавие
: Formation of a magnetic soliton lattice in copper metaborate
Место публикации
: Phys. Rev. Lett.: AMERICAN PHYSICAL SOC, 2001. - Vol. 86, Is. 9. - P1885-1888. - ISSN 0031-9007,
DOI
10.1103/PhysRevLett.86.1885
Примечания
: Cited References: 26
Предметные рубрики:
SPIN-WAVES
BA2CUGE2O7
TRANSITION
ANTIFERROMAGNET
CUGEO3
PHASE
Ключевые слова
(''Своб.индексиров.''): anisotropy--
antiferromagnetism
--ground state--magnetic moments--magnetic properties--magnetization--neutron diffraction--neutron scattering--phase transitions--solitons--thermal effects--antiferromagnetic state--copper metaborate--higher order magnetic satellites--magnetic soliton lattice--magnetic structure--copper compounds
Аннотация:
The magnetic ground state of CuB2O4 is incommensurate at T = 1.8 K and undergoes a continuous phase transition to a noncollinear commensurate antiferromagnetic state at T* similar to 10 K. Close to T* higher-order magnetic satellites are observed. Coexistence of long- and short-range magnetic order is observed in both magnetic phases. This suggests that the association of the Dzyaloshinskii-Moriya interaction and anisotropy leads to the formation of a magnetic soliton lattice.
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4.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kuz'min E. V., Ovchinnikov S. G., Singh D. J.
Заглавие
: Effect of frustrations on magnetism in the Ru double perovskite Sr2YRuO6
Место публикации
: Phys. Rev. B: AMERICAN PHYSICAL SOC, 2003. - Vol. 68, Is. 2. - Ст.24409. - ISSN 1098-0121,
DOI
10.1103/PhysRevB.68.024409
Примечания
: Cited References: 24
Предметные рубрики:
MOTT TRANSITION
LATTICE
SPIN
ANTIFERROMAGNETISM
SUPERCONDUCTIVITY
FERROMAGNETISM
Аннотация:
Localized Ru5+ spins in Sr2YRuO6 form a fcc lattice with an antiferromagnetic (AFM) nearest-neighbor (NN) coupling J approximate to 25 meV and rather low Neel temperature T-N= 26 K. Analysis of the electronic structure of Sr2RuO4 results in the effective Heisenberg model. We have studied the effect of frustrations on the AFM type-I structure of Sr2YRuO6 in the spin-wave approximation. In the model with only NN coupling the AFM state is unstable due to frustrations, and T-N = 0. Stabilization of the AFM state occurs due to the next-nearest-neighbor coupling I or due to the magnetic anisotropy D. Very small values D/J similar to I/J less than or equal to 10(-3) are enough to obtain the experimental values of T-N and sublattice magnetization m = 1.85 mu(B) /Ru (62% from the nominal S = 3/2 value).
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5.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kuz'min E. V.
Заглавие
: Quantum spin liquid and
antiferromagnetism
Место публикации
: Low Temp. Phys. - 2003. - Vol. 29, Is. 7. - P.571-578. - ISSN 1063-777X,
DOI
10.1063/1.1596582; \b Физика низких температур
Примечания
: Cited References: 9
Аннотация:
A spin liquid concept for the Heisenberg Hamiltonian (spin s=1/2) with antiferromagnetic exchange interactions between nearest neighbors is developed. The spin liquid is described by the Green's function method in the framework of a second-order theory. Equations are presented for the self-consistent calculation of the parameters of the system and its thermodynamic properties at all temperatures. A description of the spin system in the sc and bcc lattices is proposed wherein it is treated as a spatially homogeneous spin liquid with a condensate and with a singlet ground state. It is shown that the modulus of the "staggered" magnetization is expressed uniquely in terms of a condensate at a boundary point of the Brillouin zone and is the long-range order parameter. The existence region in temprature of the ordered state of the spin liquid with a condensate (TT-0) is wider than the existence region of the two-sublattice
antiferromagnetism
(T-0T-N, where T-N is the Neel temperature), while the energy is lower. For TT-0 the system passes into an ordinary spin liquid state. (C) 2003 American Institute of Physics.
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6.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kuz'min E. V., Ovchinnikov S. G., Singh D. J.
Заглавие
: Frustrated
antiferromagnetism
in the Sr2YRuO6 double perovskite
Место публикации
: J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 96, Is. 6. - P1124-1130. - ISSN 1063-7761,
DOI
10.1134/1.1591224
Примечания
: Cited References: 20. - This work was financially supported by the Russian Foundation for Basic Research (project no. 00-02-16110), RFFI-KKFN “Enisei” (project no. 02-02-97705), INTAS (grant 01-0654), and the Quantum Macrophysics Program of the Russian Academy of Sciences.
Предметные рубрики:
SPIN-WAVE
HEISENBERG-MODEL
MOTT TRANSITION
Ключевые слова
(''Своб.индексиров.''): anisotropy--
antiferromagnetism
--magnetic moments--perovskite--thermal effects--antiferromagnctic structures--double perovskite--frustrated
antiferromagnetism
--heisenberg models--strontium compounds
Аннотация:
The spins of Ru5+ ions in Sr2YRuO6 form a face-centered cubic lattice with antiferromagnetic nearest neighbor interaction J approximate to 25 meV. The antiferromagnetic structure of the first type experimentally observed below the Neel temperature T-N = 26 K corresponds to four frustrated spins of 12 nearest neighbors. In the Heisenberg model in the spin-wave approximation, the frustrations already cause instability of the antiferromagnetic state at T = 0 K. This state is stabilized by weak anisotropy D or exchange interaction I with the next-nearest neighbors. Low D/J similar to I/J similar to 10(-3) values correspond to the experimental T-N and sublattice magnetic moment values. (C) 2003 MAIK "Nauka/Interperiodica".
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7.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kuz'min E. V.
Заглавие
: Quantum spin liquid in the FCC lattice
Место публикации
: J. Exp. Theor. Phys.: AMER INST PHYSICS, 2003. - Vol. 96, Is. 1. - P129-139. - ISSN 1063-7761,
DOI
10.1134/1.1545392
Примечания
: Cited References: 12
Предметные рубрики:
HEISENBERG-ANTIFERROMAGNET
TRANSITION
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--green's function--linear systems--magnetic couplings--quantum theory--thermodynamic properties--antiferromagnetic interactions--green temperature functions--heisenberg model--quantum spin liquid--spin system--spin-wave theory--crystal lattices
Аннотация:
The properties of the spin system in the FCC lattice described by the Heisenberg model (s=1/2) with antiferromagnetic interactions between the nearest neighbors were studied. It was shown within the framework of spin-wave theory that long-range antiferromagnetic order was absent because of frustration of exchange coupling and transverse quantum spin fluctuations. The system was in the quantum spin liquid state. A method for describing it within linear second-order theory with self-consistently calculated parameters was suggested. It was proved that the ground spin liquid state was singlet. The thermodynamic properties of the spin liquid in the whole temperature range and the character of spatial spin correlations, which had alternating signs and a finite correlation length, were determined. The theory was constructed based on the method of two-time Green temperature functions. (C) 2003 MAIK "Nauka/Interperiodica".
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8.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Ovchinnikov S. G., Borisov A. A., Gavrichkov V. A., Korshunov M. M.
Заглавие
: Prediction of the in-gap states above the top of the valence band in undoped insulating cuprates due to the spin-polaron effect
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2004. - Vol. 16, Is. 8. - PL93-L100. - ISSN 0953-8984,
DOI
10.1088/0953-8984/16/8/L04
Примечания
: Cited References: 25
Предметные рубрики:
ELECTRONIC-STRUCTURE
LA2-XSRXCUO4
MODEL
ANTIFERROMAGNETISM
SPECTRA
OXIDES
Ключевые слова
(''Своб.индексиров.''): quasiparticle band structure--spin-polaron effect--antiferromagnetic materials--approximation theory--doping (additives)--electronic structure--hamiltonians--insulation--magnetic fields--strontium compounds--thermal effects--lanthanum compounds
Аннотация:
In the framework of the generalized tight binding method we have calculated the quasiparticle band structure and the spectral functions of the undoped cuprates such as La2CuO4, Sr2CUO2Cl2 etc. Due to spin fluctuations the in-gap state appears above the top of the valence band in the undoped antiferromagnetic insulator similar to in-gap states induced by hole doping. In the ARPES experiments the in-gap states can be detected as weak low energy satellites.
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9.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pankrats A. I., Petrakovskii G. A., Bezmaternykh L. N., Bayukov O. A.
Заглавие
: Antiferromagnetic resonance and phase diagrams of gadolinium ferroborate GdFe3(BO3)(4)
Разночтения заглавия
:авие SCOPUS: Antiferromagnetic resonance and phase diagrams of gadolinium ferroborate GdFe3(BO3)4
Место публикации
: J. Exp. Theor. Phys.: AMER INST PHYSICS, 2004. - Vol. 99, Is. 4. - P766-775. - ISSN 1063-7761,
DOI
10.1134/1.1826168
Примечания
: Cited References: 16
Ключевые слова
(''Своб.индексиров.''): anisotropy--antiferromagnetic materials--
antiferromagnetism
--phase diagrams--resonance--single crystals--antiferromagnetic resonance--antiferromagnets--crystal axis--transition fields--gadolinium compounds
Аннотация:
Antiferromagnetic resonance in single crystals of rhombohedral gadolinium ferroborate GdFe3(BO3)(4) was studied. The frequency-field dependences of antiferromagnetic resonance over the frequency range 26-70 GHz and the temperature dependences of resonance parameters for magnetic fields oriented along the crystal axis and in the basal plane were determined. It was found that the iron subsystem, which can be treated as a two-sublattice antiferromagnet with anisotropy of the easy-plane type, experienced ordering at T = 38 K. At temperatures below 20 K, the gadolinium subsystem with the opposite anisotropy sign strongly influenced the anisotropic properties of the crystal. This resulted in a spontaneous spin-reorientation transition from the easy-plane to the easy-axis state at 10 K. Below 10 K, magnetic field-induced transitions between the states were observed. Experimental phase diagrams on the temperature-magnetic field plane were constructed for fields oriented along the crystal axis and in the basal plane. A simple model was used to calculate the critical transition fields. The results were in close agreement with the experimental values measured at T = 4.2 K for both field orientations. (C) 2004 MAIK "Nauka / Interperiodica".
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10.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Aplesnin S. S., Petrakovskii G. A., Ryabinkina L. I., Abramova G. M., Kiselev N. I., Romanova O. B.
Заглавие
: Influence of magnetic ordering on the resistivity anisotropy of alpha-MnS single crystal
Разночтения заглавия
:авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of α-MnS single crystal; авие SCOPUS: Influence of magnetic ordering on the resistivity anisotropy of ?-MnS single crystal
Место публикации
: Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2004. - Vol. 129, Is. 3. - P195-197. - ISSN 0038-1098,
DOI
10.1016/j.ssc.2003.09.028; Solid State Commun. - 2004. - Vol. 129, Is. 3. - P195-197. - Вариант Sopus
Примечания
: Cited References: 7
Ключевые слова
(''Своб.индексиров.''): anisotropy of resistivity--optical gap--d. anisotropy of resistivity--d. optical gap--
antiferromagnetism
--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--coulomb repulsion--resistivity anisotropy--semiconducting manganese compounds--d. anisotropy of resistivity--d. optical gap--
antiferromagnetism
--band structure--bandwidth--diffractometers--electron transitions--fermi level--hamiltonians--light absorption--magnetic anisotropy--magnetization--single crystals--spectroscopic analysis--x ray diffraction analysis--coulomb repulsion--resistivity anisotropy--semiconducting manganese compounds
Аннотация:
The resistivity and the optical absorbtion spectra of single crystal alpha-MnS are studied in the temperature range 80-300 K along two directions [100] and [111]. Strong anisotropy of the resistivity, and the shift of absorbtion spectra band edge below T 160 K are explained in terms of model involving delocalized holes in 3d-band manganese ions interacting with localized spins by using the sd-model. (C) 2003 Elsevier Ltd. All rights reserved.
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11.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Kharlamova S. A., Ovchinnikov S. G., Balaev A. D., Thomas M. F., Lyubutin I. S., Gavriliuk A. G.
Заглавие
: Spin reorientation effects in GdFe3(BO3)(4) induced by applied field and temperature
Разночтения заглавия
:авие SCOPUS: Spin reorientation effects in GdFe3(BO3)4 induced by applied field and temperature
Место публикации
: J. Exp. Theor. Phys.: AMER INST PHYSICS, 2005. - Vol. 101, Is. 6. - P1098-1105. - ISSN 1063-7761,
DOI
10.1134/1.2163925
Примечания
: Cited References: 14
Предметные рубрики:
RM(3)(BO3)(4) CRYSTALS
GROWTH
Ключевые слова
(''Своб.индексиров.''):
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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12.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Korshunov M. M., Ovchinnikov S. G., Sherman A. V.
Заглавие
: Effective Hamiltonian and the properties of normal and superconductive phases of n-type cuprates
Место публикации
: Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P521-523. - ISSN 0921-4526,
DOI
10.1016/j.physb.2005.01.134
Примечания
: Cited References: 13
Предметные рубрики:
MODEL
SYMMETRY
Ключевые слова
(''Своб.индексиров.''): strong electron correlations--superconductivity--multiband p-d model--n-type cuprates--multiband p-d model--n-type cuprates--strong electron correlations--superconductivity--
antiferromagnetism
--correlation theory--fermi surface--hamiltonians--mathematical models--microscopic examination--oxide superconductors--phase diagrams--semiconductor doping--generalized tight-binding (gtb)--multiband p-d models--n-type cuprates--single electron correlations--superconductivity
Аннотация:
In the framework of the effective low-energy model for high-T-c, cuprates with account for three-center interaction terms and spin fluctuations the properties of normal and superconducting phases of n-type cuprates are investigated. Microscopic model parameters were obtained from ARPES data in undoped compounds. Obtained evolution of the chemical potential with doping, Fermi surface at optimal doping, and T-c(x) phase diagram are in remarkably good agreement with the experiment. (c) 2005 Elsevier B.V. All rights reserved.
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13.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Bayukov O. A., Gavrilyuk A. M., Zabluda V. N., Lyubutin I. S., Ovchinnikov S. G., Potseluyko A. M., Tomas M., Trojan I. A., Kharlamova S. A.
Заглавие
: Studies of magnetic and optic properties of rare-earth gallo-ferroborates by Mossbauer and optical spectroscopy
Место публикации
: Physica B: ELSEVIER SCIENCE BV, 2005. - Vol. 359: International Conference on Strongly Correlated Electron Systems (SCES 04) (JUL 26-30, 2004, Karlsruhe, GERMANY). - P1321-1323. - ISSN 0921-4526,
DOI
10.1016/j.physb.2005.01.397
Примечания
: Cited References: 3
Ключевые слова
(''Своб.индексиров.''): 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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14.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Vasiliev A. N., Popova E. A., Bezmaternykh L. N., Temerov V. L., Hiroi Z.
Заглавие
: Specific heat of YFe3(BO3)(4), Y0.5Gd0.5Fe3(BO3)(4), and GdFe3(BO3)(4)
Разночтения заглавия
:авие SCOPUS: Specific heat of YFe3(BO3)4, Y 0.5Gd0.5Fe3(BO3)4, and GdFe3(BO3)4
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2006. - Vol. 102, Is. 2. - P262-265. - ISSN 1063-7761,
DOI
10.1134/S1063776106020075
Примечания
: Cited References: 10
Предметные рубрики:
TRIGONAL GDFE3(BO3)(4)
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--gadolinium compounds--heat transfer--ions--magnetic fields--single crystals--temperature measurement--yttrium compounds--magnetic entropy--magnetic system--reorientational transitions--scaling procedure--specific heat of solids
Аннотация:
The specific heat was measured in the range 0.4-300 K in YFe3(BO3)(4), Y0.5Gd0.5Fe3(BO3)(4), and GdFe3(BO3)(4) single crystals. Sharp anomalies were found at temperatures of first-order structural, second-order antiferromagnetic, and first-order spin-reorientational transitions. A Neel temperature of about 37 K was found to be virtually independent of presence of rare-earth ions, indicating rather weak coupling of Gd and Fe subsystems. The contribution of the magnetic system to specific heat was separated through the scaling procedure allowing determination of the magnetic entropy of Fe and Gd subsystems. At the lowest temperatures, the specific heat in GdFe3(BO3)(4) exhibits a Schottky-type anomaly, which is due to Gd3+ eightfold degenerate ground-level splitting by the internal magnetic field of the Fe subsystem of about 7 T.
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15.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Dzebisashvili D. M.
Заглавие
: Canted phase of an antiferromagnetic Anderson lattice
Место публикации
: Physica B: ELSEVIER SCIENCE BV, 2006. - Vol. 378-80: International Conference on Strongly Correlated Electron Systems (SECES 05) (JUL 26-30, 2005, Vienna, AUSTRIA). - P692-693. - ISSN 0921-4526,
DOI
10.1016/j.physb.2006.01.223
Примечания
: Cited References: 5
Ключевые слова
(''Своб.индексиров.''): heavy fermions--antiferromagnetic canted phase--antiferromagnetic canted phase--heavy fermions--
antiferromagnetism
--band structure--magnetic field effects--magnetic fields--magnetization--spectrum analysis--thermal effects--antiferromagnetic canted phase--energy spectrum--heavy fermions--quasiparticle bands--fermions
Аннотация:
On the basis of extended periodic Anderson model with anti ferromagnetic (AFM) exchange and s-f exchange interactions the energy spectrum of heavy-fermion (HF) AFM metals is calculated. The quasiparticle band structure in collinear AFM phase is described by four splitted bands one of which is very narrow (order of exchange interaction constant) and lies in the vicinity of a localized level. Application of an external magnetic field causes a canting of the sublattice magnetization and due to s-f exchange interaction strongly modifies the HF band picture. Thus eight different quasiparticle bands appear. Their evolution when temperature and magnetic field change is studied. (c) 2006 Elsevier B.V. All rights reserved.
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16.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Popova E. A., Tristan N., Hess C., Klingeler R., Buchner B., Bezmaternykh L. N., Temerov V. L., Vasil'ev A. N.
Заглавие
: Magnetic and thermal properties of single-crystal NdFe3(BO3)4
Разночтения заглавия
:авие SCOPUS: Magnetic and thermal properties of single-crystal NdFe3(BO3)4
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 1. - P105-107. - ISSN 1063-7761,
DOI
10.1134/S1063776107070229
Примечания
: Cited References: 4
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--magnetic field effects--magnetic properties--rare earths--single crystals--thermodynamic properties--antiferromagnetic transition--crystallographic axes--kramers doublet--neodymium ferroborate--neodymium compounds
Аннотация:
The neodymium ferroborate NdFe3(BO3)(4) undergoes an antiferromagnetic transition at T-N = 30 K, which manifests itself as a lambda-type anomaly in the temperature dependence of the specific heat C and as inflection points in the temperature dependences of the magnetic susceptibility chi measured at various directions of an applied magnetic field with respect to the crystallographic axes of the sample. Magnetic ordering occurs only in the subsystem of Fe3+ stop ions, whereas the subsystem of Nd3+ stop ions remains polarized by the magnetic field of the iron subsystem. A change in the population of the levels of the ground Kramers doublet of neodymium ions manifests itself as Schottky-type anomalies in the C(T) and chi(T) dependences at low temperatures. At low temperatures, the magnetic properties of single-crystal NdFe3(BO3)(4) are substantially anisotropic, which is determined by the anisotropic contribution of the rare-earth subsystem to the magnetization. The experimental data obtained are used to propose a model for the magnetic structure of NdFe3(BO3)(4).
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17.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Korshunov M. M., Gavrichkov V. A., Ovchinnikov S. G., Nekrasov I. A., Kokorina E. E., Pchelkina Z. V.
Заглавие
: Dominance of many-body effects over the one-electron mechanism for band structure doping dependence in Nd2-xCexCuO4: the LDA + GTB approach
Разночтения заглавия
:авие SCOPUS: Dominance of many-body effects over the one-electron mechanism for band structure doping dependence in Nd2-xCexCuO4: The LDA+GTB approach
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2007. - Vol. 19, Is. 48. - Ст.486203. - ISSN 0953-8984,
DOI
10.1088/0953-8984/19/48/486203
Примечания
: Cited References: 36
Предметные рубрики:
NARROW ENERGY BANDS
HUBBARD-MODEL
SUPERCONDUCTORS
DENSITY
TEMPERATURE
ORBITALS
WAVE
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--band structure--correlation methods--crystal structure--local density approximation--superconducting materials--electronic correlations--fermionic quasiparticles--neodymium compounds
Аннотация:
In the present work we report band structure calculations for the high-temperature superconductor Nd2-xCexCuO4 in the regime of strong electronic correlations within an LDA + GTB method, which combines the local density approximation (LDA) and the generalized tight-binding method (GTB). The two mechanisms of band structure doping dependence were taken into account. Namely, the one-electron mechanism provided by the doping dependence of the crystal structure, and the many-body mechanism provided by the strong renormalization of the fermionic quasiparticles due to the large on-site Coulomb repulsion. We have shown that, in the antiferromagnetic and in the strongly correlated paramagnetic phases of the underdoped cuprates, the main contribution to the doping evolution of the band structure and Fermi surface comes from the many-body mechanism.
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18.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Val'kov V. V., Mitskan V. A.
Заглавие
: Magnetic-field-induced phase transition in a two-dimensional quantum magnet with plaquette distortion
Место публикации
: J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2007. - Vol. 105, Is. 1. - P90-93. - ISSN 1063-7761,
DOI
10.1134/S1063776107070199
Примечания
: Cited References: 10
Предметные рубрики:
GROUND-STATE
CRYSTALS
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--magnetic field effects--magnets--phase diagrams--problem solving--spectrum analysis--plaquette distortion--quantum heisenberg magnet--quantum transition--two-dimensional quantum magnet--phase transitions
Аннотация:
Magnetic field effect on the structure of the ground state of a two-dimensional quantum Heisenberg magnet is analyzed. A plaquette representation is used to solve the self-consistent problem and calculate the collective excitation spectrum in a magnetic field. Conditions are found for quantum transition between non-magnetic and oblique antiferromagnetic phases. The change in the ground state of the system is associated with disappearance of the gap in the spin excitation spectrum. Effects of frustration and magnetic field on the spectrum are analyzed. A phase diagram of stable singlet and magnetically ordered phases is presented.
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19.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Volkov N. V., Sablina K. A., Eremin E. V., Boni P., Shah V. R., Flerov I. N., Kartashev A., Rasch JCE, Boehm M., Schefer J.
Заглавие
: Heat capacity of a mixed-valence manganese oxide Pb(3)Mn(7)O(15)
Коллективы
:
Разночтения заглавия
:авие SCOPUS: Heat capacity of a mixed-valence manganese oxide Pb3Mn 7O15
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2008. - Vol. 20, Is. 44. - Ст.445214. - ISSN 0953-8984,
DOI
10.1088/0953-8984/20/44/445214
Примечания
: Cited References: 11. - This study was supported by the INTAS (project No 061000013-9002), the Division of Physical Sciences of RAS, program `Spin-dependent Effects in Solids and Spintronics' (project No. 2.4.2 of SB RAS), the President of the Russian Federation, grant for Support of Leading Scientific Schools (project No. NSh-1011.2008.2), KRSF-RFBR `Enisey2007', project No. 07-02-96801-a, and the Siberian Branch of RAS, Integration project No. 3.7.
Ключевые слова
(''Своб.индексиров.''):
antiferromagnetism
--crystallography--entropy--lead alloys--magnetic materials--magnetism--manganese--manganese compounds--powders--single crystals--specific heat--spin dynamics--antiferromagnetic orders--charge localizations--entropy losses--excess heat capacities--experimental datums--heat capacities--magnetic contributions--magnetic orders--magnetic states--magnetic subsystems--magnetic transitions--manganese oxides--nonmagnetic--spin systems--temperature curves--temperature dependences--temperature intervals--temperature ranges--manganese alloys
Аннотация:
We present the results of a heat capacity study of Pb(3)Mn(7)O(15) single crystals with approximately equal concentrations of Mn(3+) and Mn(4+) ions. In the temperature interval between 210 and 260 K, an excess heat capacity of nonmagnetic origin, most likely associated with the process of charge localization, has been observed. Also, three pronounced anomalies corresponding to the changes in a magnetic subsystem of the crystal have been observed in the temperature dependence of the heat capacity. A broad hump near 150 K is related to the formation of a short-range magnetic order. This process of short-range ordering is rather prominent, considering the appreciable value of the entropy loss accompanying the change in the magnetic state. A clear lambda-shaped peak at 70 K marks the onset of a long-range antiferromagnetic order. Another anomalous contribution to the heat capacity of magnetic origin has been revealed at temperatures below 20 K. This contribution is associated with a magnetic transition of an unknown nature, which is also clearly evident in magnetization versus temperature curves. The total magnetic contribution to the entropy deduced from the actual experimental data over the entire temperature range is much smaller than is expected for a completely ordered Mn spin system in the crystal. We suggest several possible reasons that may account for this `missing' entropy.
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20.
Вид документа
: Статья из журнала
Шифр издания
:
Автор(ы)
: Pankrats A. I., Petrakovskii G. A., Kartashev A., Eremin E. V., Temerov V. L.
Заглавие
: Low-temperature magnetic phase diagram of HoFe3(BO3)(4) holmium ferroborate: a magnetic and heat capacity study
Разночтения заглавия
:авие SCOPUS: Low-temperature magnetic phase diagram of HoFe3(BO 3)4 holmium ferroborate: A magnetic and heat capacity study
Место публикации
: J. Phys.: Condens. Matter: IOP PUBLISHING LTD, 2009. - Vol. 21, Is. 43. - Ст.436001. - ISSN 0953-8984,
DOI
10.1088/0953-8984/21/43/436001
Примечания
: Cited References: 20
Предметные рубрики:
SINGLE-CRYSTAL
DYFE3(BO3)(4)
ND3+
Ключевые слова
(''Своб.индексиров.''): antiferromagnetic state--applied magnetic fields--characteristic temperature--crystal axis--heat capacities--low temperatures--magnetic field parallel--magnetic phase diagrams--magnetic phase transitions--magnetization jump--schottky anomaly--spin reorientation transitions--thermal measurements--antiferromagnetic materials--
antiferromagnetism
--holmium--magnetic fields--phase diagrams--single crystals--specific heat--phase transitions
Аннотация:
We present the results of the magnetic and heat capacity study of a magnetic phase diagram of a HoFe3(BO3)(4) single crystal. Two magnetic phase transitions are found in the low-temperature region. The transition from the paramagnetic to easy-plane antiferromagnetic state occurs at T-N = 37.4 K and is independent of an applied magnetic field. The sharp heat capacity peaks and magnetization jumps corresponding to the spontaneous and field-induced spin-reorientation transitions between the easy-axis and easy-plane states are observed below 4.7 K. Also, the additional heat capacity peaks, which can be attributed to the Schottky anomalies with the field-dependent characteristic temperatures, are found. According to the magnetic and thermal measurement data, the magnetic phase diagrams of HoFe3(BO3)(4) for the magnetic field parallel and perpendicular to the crystal axis are constructed.
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