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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Golovnya A. A., Korovushkin M. M.
Заглавие : Pseudogap formation in copper oxide superconductors with inclusion of spin and charge fluctuations
Место публикации : Phys. Solid State: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2011. - Vol. 53, Is. 10. - P2001-2004. - ISSN 1063-7834, DOI 10.1134/S1063783411100349
Примечания : Cited References: 15. - This study was supported by the Presidium of the Russian Academy of Sciences (Program "Quantum Physics of Condensed Matter"), the Russian Foundation for Basic Research (project no. 09-02-00127), the Siberian Branch of the Russian Academy of Sciences (Interdisciplinary Integration project no. 53), and the Ministry of Education and Science of the Russian Federation (Russian Federal Targeted Program "Scientific and Scientific-Pedagogical Personnel of the Innovative Russia" in 2009-2013).
Предметные рубрики: ANTIFERROMAGNETS
DYNAMICS
Аннотация: The influence of spin and charge fluctuations on the pseudogap formation in cuprate superconductors has been studied using the diagram technique for Hubbard operators. It has been shown that the joint inclusion of the spin and charge fluctuations leads to the formation of "shadow" bands with a strong modulation of the spectral intensity and to a decrease in the density of electronic states at the Fermi level.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Val'kov V. V., Golovnya A. A., Korovushkin M. M.
Заглавие : Kinematic mechanism of the modulation of the spectral intensity in the spatially uniform system of Hubbard fermions
Место публикации : JETP Letters. - 2011. - Vol. 94, Is. 3. - P.197-201. - ISSN 0021-3640, DOI 10.1134/S0021364011150148
Примечания : Cited References: 21. - We are grateful to R.O. Zaitsev and N.M. Plakida for the constructive criticism and helpful discussions. This work was supported by the Presidium of the Russian Academy of Sciences (program "Quantum Physics of Condensed Matter"), the Russian Foundation for Basic Research (project no. 09-02-00127), the Ministry of Education and Science of the Russian Federation (federal program "Scientific and Pedagogical Personnel of Innovative Russia" for 2009-2013), and the Siberian Branch, the Russian Academy of Sciences (integration project no. 53). The work of A.A.G. and M.M.K. was also supported by the Council of the President of the Russian Federation for Support of Young Scientists and Leading Scientific Schools (grant no. MK-1300-2011.2) and by the Siberian Branch, Russian Academy of Sciences (Lavrent'ev Competition).
Предметные рубрики: SPIN SUSCEPTIBILITY
ANTIFERROMAGNETS
DYNAMICS
CHARGE
MODEL
Аннотация: Using the exact representation of the Green's function constructed in terms of the Hubbard operators, it has been shown that the kinematic interaction that induces the spin-fluctuation processes in the spatially uniform system of Hubbard fermions leads to significant variations in the spectral intensity A(k, omega) in the Brillouin zone. As a result, the modulation of A(k, omega) appears in the Fermi contour. The sign of the hopping integral within the first coordination sphere is determined by the contour section, where A(k, omega) decreases according to the angle-resolved photoemission spectroscopy data.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Janoschek M., Fischer P., Schefer J., Roessli B., Pomjakushin V., Meven M., Petricek V., Petrakovskii G. A., Bezmaternykh L. N.
Заглавие : Single magnetic chirality in the magnetoelectric NdFe3((BO3)-B-11)(4)
Разночтения заглавия :авие SCOPUS: Single magnetic chirality in the magnetoelectric NdFe3( 11BO3 )4
Место публикации : Phys. Rev. B: AMER PHYSICAL SOC, 2010. - Vol. 81, Is. 9. - Ст.94429. - ISSN 1098-0121, DOI 10.1103/PhysRevB.81.094429
Примечания : Cited References: 55
Предметные рубрики: NEUTRON-DIFFRACTION
PHASE-TRANSITIONS
SLOW-NEUTRONS
CRYSTAL
NDFE3(BO3)(4)
EXTINCTION
NUCLEAR
ORDER
MNSI
ANTIFERROMAGNETS
Аннотация: We have performed an extensive study of single crystals of the magnetoelectric NdFe3 ((BO3)-B-11)(4) by means of a combination of single-crystal neutron diffraction and spherical neutron polarimetry. Our investigation did not detect significant deviations at low temperatures from space group R32 concerning the chemical structure. With respect to magnetic ordering our combined results demonstrate that in the commensurate magnetic phase below T-N approximate to 30 K all three magnetic Fe moments and the magnetic Nd moment are aligned ferromagnetically in the basal hexagonal plane but align antiferromagnetically between adjacent planes. The phase transition to the low-temperature incommensurate (IC) magnetic structure observed at T-IC approximate to 13.5 K appears to be continuous. By means of polarized neutron studies it could be shown that in the incommensurate magnetic phase the magnetic structure of NdFe3((BO3)-B-11)(4) is transformed into a long-period antiferromagnetic helix with single chirality. Close to the commensurate-incommensurate phase transition third-order harmonics were observed, which in addition indicate the formation of magnetic solitons.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Dimer state in the two-dimensional anisotropic alternated-exchange Heisenberg model
Место публикации : Phys. Solid State: AMER INST PHYSICS, 1998. - Vol. 40, Is. 6. - P986-990. - ISSN 1063-7834, DOI 10.1134/1.1130463
Примечания : Cited References: 14
Предметные рубрики: SPIN-PEIERLS
HUBBARD-MODEL
SUPERCONDUCTIVITY
ANTIFERROMAGNETS
Аннотация: An analysis is made of the two-dimensional Heisenberg model with S = 1/2, anisotropic exchange interaction between nearest neighbors, and alternating exchange in two directions, [100] and [010] (corresponding to condensation of the (pi,pi) mode) and in one direction [100] (corresponding to condensation of the (pi,0) mode), The quantum Monte Carlo method is used to calculate the thermodynamic characteristics and the spin correlation functions which are used as the basis to determine the boundary of stability of an anisotropic antiferromagnetic with respect to alternation of exchange delta = (1 - J(x,y) / J(z))(0.4) in the (pi,pi) model and delta = (1 - J(x,y) / J(z))(0.31) in the (pi,0) model. In the (pi,0) model a disordered quantum state exists in the range (1 - J(x,y) / J(z))(0.31) delta (0.3-0.35). The energy (E - 0.68)
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : GEKHT R. S., PONOMAREV V. I.
Заглавие : LOW-TEMPERATURE PROPERTIES OF QUASI-2-DIMENSIONAL FRUSTRATED ANTI-FERROMAGNETICS
Место публикации : Fiz. Tverd. Tela: MEZHDUNARODNAYA KNIGA, 1994. - Vol. 36, Is. 11. - P3394-3397. - ISSN 0367-3294
Примечания : Cited References: 8
Предметные рубрики: PHASE-TRANSITIONS
MAGNETIC STATES
ANTIFERROMAGNETS
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Temperature-induced weak ferromagnetism in an anisotropic magnetic with competing interactions
Место публикации : Zhurnal Eksperimentalnoi Teor. Fiz. - 1991. - Vol. 99, Is. 1. - P.189-193. - ISSN 0044-4510
Примечания : Cited References: 10
Предметные рубрики: ANTIFERROMAGNETS
Аннотация: The region of temperature and exchange with a temperature-induced weak ferro magnetic moment in a magnet with competing interactions in the second coordination sphere and with anisotropic distribution of opposite sign bonds possessing a tensor nature in the first sphere is determined by the Monte Carlo method. The temperature dependence of the susceptibility, specific heat and magnetization in an external field is determined.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S.
Заглавие : Magnetic phases of a stochastic anisotropic hexagonal magnet
Место публикации : Fiz. Tverd. Tela. - 1990. - Vol. 32, Is. 11. - P.3220-3229. - ISSN 0367-3294
Примечания : Cited References: 11
Предметные рубрики: TRIANGULAR-LATTICE
ANTIFERROMAGNETS
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