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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Ovchinnikov S. G., Korshunov M. M., Kozeeva L. P., Lavrov A. N.
Заглавие : Peculiarity of interrelation between electronic and magnetic properties of HTSC cuprates associated with short-range antiferromagnetic order
Коллективы :
Место публикации : J. Exp. Theor. Phys.: MAIK NAUKA/INTERPERIODICA/SPRINGER, 2010. - Vol. 111, Is. 1. - P104-113. - ISSN 1063-7761, DOI 10.1134/S1063776110070101
Примечания : Cited References: 48. - This study was financially supported by the Russian Foundation for Basic Research (project nos. 09-02-01224 and 09-02-00127) and under the program "Quantum Physics of Condensed Media" of the Presidium of the Russian Academy of Sciences (project no. 5.7).
Предметные рубрики: T-J MODEL
NORMAL-STATE
FERMI-SURFACE
RESISTIVITY ANISOTROPY
3-CENTER INTERACTIONS
OPTICAL CONDUCTIVITY
COPPER OXIDES
CUO2 PLANES
SUPERCONDUCTORS
TRANSPORT
Ключевые слова (''Своб.индексиров.''): anisotropic resistivity--antiferromagnetic orders--concentration dependence--cuprates--doping levels--electronic and magnetic properties--fermi surface topology--high temperature superconducting--magnetic orders--magnetic state--maximum values--pseudo-gap--short-range magnetic orders--strong electron correlations--temperature dependence--anisotropy--antiferromagnetic materials--antiferromagnetism--copper compounds--correlators--electronic properties--high temperature superconductors--hole concentration--magnetic properties--neon--superconducting magnets--single crystals
Аннотация: We report on the results of measurements of anisotropic resistivity of RBa(2)Cu(3)O(6 + x) (R = Tm, Lu) high-temperature superconducting single crystals in a wide range of doping levels, indicating a nontrivial effect of magnetic order on the electronic properties of cuprates. In particular, our results visually demonstrate the crossover from the state with moderate anisotropy of resistivity rho (c) /rho (ab) similar to 30 to a strongly anisotropic state with rho (c) /rho (ab) similar to 7 x 10(3) upon cooling as well as upon a decrease in the hole concentration in the CuO(2) planes. It is also shown that anisotropy is sensitive to the magnetic state of CuO(2) planes and attains its maximum value after the establishment of the long-range antiferromagnetic order. The results are discussed in the framework of the theory based on the t-t'-taEuro(3)-J model of CuO(2) layers taking into account strong electron correlations and short-range magnetic order. In this theory, anomalies of spin correlators and Fermi surface topology for a critical hole concentration of p* a parts per thousand 0.24 are demonstrated. The concentration dependence of the charge carrier energy indicates partial suppression of energy due to the emergence of a pseudogap at p p*. This theory explains both the experimentally observed sensitivity of anisotropy in conductivity to the establishment of the antiferromagnetic order and the absence of anomalies in the temperature dependence of resistivity rho (ab) (T) in the vicinity of the N,el temperature.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Aplesnin S. S., Ryabinkina L. I., Romanova O. B., Har'kov A. M., Gorev M. V., Balaev A. D., Eremin E. V., Bovina A. F.
Заглавие : The magnetoelastic effect in CoxMn1-xS solid solutions
Коллективы :
Разночтения заглавия :авие SCOPUS: The magnetoelastic effect in Cox Mn1 - x S solid solutions
Место публикации : Solid State Commun.: PERGAMON-ELSEVIER SCIENCE LTD, 2010. - Vol. 150, Is. 13-14. - P564-567. - ISSN 0038-1098, DOI 10.1016/j.ssc.2010.01.009
Примечания : Cited References: 13. - This work was supported by the Russian Foundation for Basic Research projects no. 08-02-00364-a, no. 08-02-90031, no. F08037, F08-229, and no. 09-02-00554-a.
Предметные рубрики: YVO3 SINGLE-CRYSTAL
SPIN-STATE
TRANSITION
TRANSPORT
PHYSICS
LACOO3
Ключевые слова (''Своб.индексиров.''): semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--galvanomagnetic effects--thermal expansion--semiconductors--x-ray scattering--coefficient of thermal expansion--magnetoelastic effects--orbital ordering--temperature hysteresis--temperature range--zero magnetic fields--crystallization--electric resistance--magnetic field effects--magnetoresistance--manganese--manganese compounds--neon--organic polymers--scattering--semiconductor quantum dots--solid solutions--solidification--thermal stress--x ray scattering--thermal expansion
Аннотация: The magnetization of cation-substituted CoxMn(1-x)S sulfides upon cooling in zero magnetic field and in a field in the temperature range 4-300 K has been measured and the resistance versus magnetic field (up to 10 kOe) dependences have been obtained. Magnetoresistance and temperature hysteresis of magnetization versus prehistory are found at the magnetic field H 0.1 T and at T 240 K. The interrelation between the magnetic and elastic subsystems of the CoxMn1-xS solid solutions has been established. A jump in the coefficient of thermal expansion is observed at the Neel temperature. The features of the physical properties are explained by orbital ordering. (C) 2010 Elsevier Ltd. All rights reserved.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Popova M. N., Stanislavchuk T. N., Malkin B. Z., Bezmaternykh L. N.
Заглавие : Breaking of the Selection Rules for Optical Transitions in the Dielectric PrFe3(BO3)(4) Crystal by a Praseodymium-Iron Exchange Interaction
Коллективы : RFBR [07-02-01185, 07-02-00704]; Russian Academy of Sciences
Разночтения заглавия :авие SCOPUS: Breaking of the selection rules for optical transitions in the dielectric PrFe3(BO3)4 crystal by a praseodymium-iron exchange interaction
Место публикации : Phys. Rev. Lett.: AMER PHYSICAL SOC, 2009. - Vol. 102, Is. 18. - Ст.187403. - ISSN 0031-9007, DOI 10.1103/PhysRevLett.102.187403
Примечания : Cited References: 26. - This work was supported in part by the RFBR under Grants No. 07-02-01185 and No. 07-02-00704 and by the Russian Academy of Sciences under the Programs for Basic Research.
Предметные рубрики: SINGLE-CRYSTAL
GDFE3(BO3)(4)
PHASE
DYFE3(BO3)(4)
SPECTRUM
LINES
Ключевые слова (''Своб.индексиров.''): magnetic ordering temperatures--optical spectrum--order parameters--point symmetries--selection rules--exchange interactions--neon--praseodymium--single crystals--crystal symmetry
Аннотация: We report on the emergence of new lines in the optical spectrum of the PrFe3(BO3)(4) single crystal at the magnetic ordering temperature. The transitions between singlet crystal-field sublevels of Pr3+ ion with the same transformational properties, strictly forbidden for the trigonal D-3 point symmetry of this ion in PrFe3(BO3)(4), appear below the Neel temperature and grow in intensity as a square of the order parameter. We show that the phenomenon originates from the mixing of wave functions of different Pr3+ sublevels by the Pr-Fe exchange interaction.
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Вид документа : Статья из журнала
Шифр издания :
Автор(ы) : Nazarov V. G., Gunyakov V. A., Parshin A. M., Zyryanov V. Ya., Shabanov V. F.
Заглавие : Optical anisotropy of uniaxially oriented films of polymer-encapsulated liquid crystals
Коллективы : International Seminar on Display Optics
Место публикации : J. Opt. Technol. - 2005. - Vol. 72, Is. 9. - P.675-677. - SEP. - ISSN 1070-9762, DOI 10.1364/JOT.72.000675
Примечания : Cited Reference Count: 13
Ключевые слова (''Своб.индексиров.''): dichroic dyes--laser radiation--optical anisotropy--uniaxially oriented films--anisotropy--density (optical)--dyes--helium neon lasers--light polarization--light scattering--light transmission--liquid crystal polymers--optical films
Аннотация: Uniaxially oriented films of polymer-encapsulated liquid crystals (PELCs) possess strong light-scattering anisotropy. The macroscopic transmittance anisotropy in uniaxially oriented PELC films can be strengthened by adding dichroic dyes to the LC drops. The ratio T-perpendicular to/T-parallel to of the principal components of the optical transmittance polarized perpendicular and parallel to the orientation of the PELCs, respectively, has been measured for He-Ne laser radiation transmitted through uniaxially oriented samples. The experiments showed that the transmittance anisotropy T-perpendicular to/T-parallel to for samples doped with dye is greater than the anisotropy caused only by light scattering. (c) 2005 Optical Society of America.
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