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  • 1
    Language: English
    In: Physics of the Solid State, 2012, Vol.54(8), pp.1704-1708
    Description: The numerical simulation of the behavior of the molecules of the DOBAMBC liquid crystal by the molecular dynamics method allowed us to find the change of the the conformation of molecules as a function of temperature and to reveal the helical structures with various pitches in the smectic phase C *. These results explained the anomalous temperature dependences of the order parameter at the molecular level, as well as the optical second harmonic generation in the region of smectic A .
    Keywords: Physics ; Solid State Physics ; Physics;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 2
    Language: English
    In: Physics of the Solid State, 2010, Vol.52(11), pp.2303-2306
    Description: The dynamics of magnetization in triangle lattices of the Ising chains has been investigated in terms of the Glauber theory. The results of three-dimensional numerical simulation of the magnetic structure and magnetization curves of Ca 3 Co 2 O 6 are presented. The structures of the low-temperature and high-temperature phases differ significantly: the false frustrated low-temperature phase is transformed into a partially disordered antiferromagnetic honeycomb structure. Two additional magnetization steps at low temperatures are formed at the expense of the domain structure and the ferrimagnetic phase. All fundamental hypotheses used in terms of the two-dimensional model have found their confirmation during the three-dimensional simulation.
    Keywords: Cobalt ; Magnetization;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 3
    Language: English
    In: Physics of the Solid State, 15 November 2018, Vol.60(11)
    Description: Abstract—A technique of measuring the rotation of the light polarization plane in pulsed magnetic fields with strength up to 40 T with a sensitivity of  0.1° is proposed. The Faraday effect has been studied in films of diluted ferrites—garnets (Lu,Bi){sub 3}(Fe,Ga,Al){sub 5}O{sub 12} in the temperature range from room temperature to 78 K, including the vicinity of the magnetic moment compensation temperature. The transition to the noncollinear phase in the magnetic phase diagram is shown to occur at a magnetic field strength higher than 30 T at room temperature, and the threshold transition field tends to zero when approaching the magnetic moment compensation temperature.
    Keywords: Condensed Matter Physics, Superconductivity And Superfluidity ; Bismuth Compounds ; Faraday Effect ; Ferrites ; Films ; Garnets ; Magnetic Fields ; Magnetic Moments ; Magneto-Optical Effects ; Phase Diagrams ; Polarization ; Pulses ; Sensitivity ; Temperature Range 0065-0273 K ; Temperature Range 0273-0400 K ; Physics
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 4
    Language: English
    In: Physics of the Solid State, 2001, Vol.43(3), pp.416-419
    Description: The effective Hamiltonian for a realistic multiband p - d model is developed. In the case of electron doping, the Hamiltonian coincides with that for the standard t - J model. For hole doping, the singlet-triplet t - J model takes place.
    Keywords: Physics ; Solid State Physics and Spectroscopy ; Physics;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 5
    Language: English
    In: Physics of the Solid State, 2003, Vol.45(8), pp.1415-1422
    Description: By on the analyzing the general structure of the Green function of a strongly correlated electron system, it is shown that, for the regime of strong correlations, Luttinger’s theorem should be generalized in the following way: the volume of the Fermi surface of the system of noninteracting particles is equal to that of the quasiparticles in the strongly correlated system with due regard for the spectral weight of the quasiparticles. An investigation of the t-J model and of the Hubbard model, as applied to the paramagnetic nonsuperconducting phase, shows that the generalized Luttinger theorem is valid for these models.
    Keywords: Physics ; Solid State Physics and Spectroscopy ; Physics;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 6
    Language: English
    In: Physics of the Solid State, 2018, Vol.60(11), pp.2207-2210
    Description: Abstract —A technique of measuring the rotation of the light polarization plane in pulsed magnetic fields with strength up to 40 T with a sensitivity of  0.1° is proposed. The Faraday effect has been studied in films of diluted ferrites—garnets (Lu,Bi) 3 (Fe,Ga,Al) 5 O 12 in the temperature range from room temperature to 78 K, including the vicinity of the magnetic moment compensation temperature. The transition to the noncollinear phase in the magnetic phase diagram is shown to occur at a magnetic field strength higher than 30 T at room temperature, and the threshold transition field tends to zero when approaching the magnetic moment compensation temperature.
    ISSN: 1063-7834
    E-ISSN: 1090-6460
    Source: Springer Science & Business Media B.V.
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  • 7
    Language: English
    In: Physics of the Solid State, 2008, Vol.50(8), pp.1401-1406
    Description: The temperature evolution of in-gap states created by the spin polaron effect and located within the gap with charge transfer between the valence and conduction bands is studied for the case of strong electron correlations using the t-t′-t″-J model of antiferromagnetic undoped cuprates. The effect of temperature is taken into account by temperature renormalization of the magnon concentration, which is calculated using the Heisenberg model with inclusion of weak interlayer exchange and weak in-plane spin anisotropy, and by introducing a Lorentzian with a temperature-dependent half-width in the form corresponding to the marginal Fermi liquid model. With increasing temperature, the spectral weight of the in-gap state, which is proportional to the magnon concentration, grows leading to an increased intensity of the corresponding peak of the spectral function in all points of the Brillouin zone. At points (π/2, π/2) and (π, 0), the main peak is approached by the satellite peak related to the in-gap band and, at points (0, 0) and (π, π), the peaks move away from each other.
    Keywords: 74.72.-h ; 74.25.Jb ; 74.25.Ha ; 79.60.-i
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 8
    Language: English
    In: Physics of the Solid State, 1997, Vol.39(9), pp.1393-1395
    Description: The results of polarization studies of the low-frequency optical Raman spectra of solid solutions of paradibromobenzene with p -dichlorobenzene (10% paradichlorobenzene) are reported. The spectra of lattice vibrations of the mixed crystals are calculated, and it is shown that vacancies can be present in their structure, in agreement with the experimental spectra. The existence of vacancies is manifested by the appearance of secondary lines in the low-frequency spectrum, in the vicinity of 70 cm −1 . The intensities of the lines are related to the number of vacancies. The diffusion activation energies in mixed crystals of paradibromobenzene with paradichlorobenzene with vacancies present in their structure are calculated at different temperatures on the basis of the method of atom-atom potentials. It is shown that the activation energy in these mixed crystals is not as dependent on the temperature variation and the crystallographic direction as in crystals of the constituent components.
    Keywords: Physics ; Solid State Physics and Spectroscopy ; Physics;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 9
    Language: English
    In: Physics of the Solid State, 1998, Vol.40(10), pp.1664-1666
    Description: Based on polarization measurements of the low-frequency Raman spectra of p -bromochlorobenzene and calculations of the frequency spectra of lattice vibrations by the Dean method it is shown that the structure may contain vacancies. Their presence affects the appearance of additional lines in the low-frequency spectrum, particularly in the vicinity of 70 cm −1 , and their positions depend weakly on the orientational disorder of the molecules with respect to the para substituents. The activation energies for diffusion in a randomly disordered p -bromochlorobenzene crystal with vacancies in the structure is calculated from atom-atom potentials. It is shown that the value of the activation energy varies along a selected direction and depends on the arrangement of the p -bromochlorobenzene molecules with respect to the para substituents, in contrast to the results for ordered p -dibromobenzene and p -dichlorobenzene.
    Keywords: Solar System;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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  • 10
    Language: English
    In: Physics of the Solid State, 2000, Vol.42(7), pp.1277-1279
    Description: Polarization studies of low-frequency Raman spectra of solid solutions of p -dichlorobenzene with p -bromchlorobenzene (50% p -dichlorobenzene) were carried out. Analysis of the lattice vibration spectra of these mixed crystals shows that vacancies can be present in their structure. The presence of vacancies is responsible for the emergence of additional lines, including those in the 70 cm −1 region. The calculation of the diffusion activation energy in a mixed crystal proves that its magnitude is determined by the spatial arrangement of p -bromchlorobenzene molecules in the lattice, their orientation relative to parahalides, and (to a lesser extent) temperature variations.
    Keywords: Maximum Ineffective Concentrations;
    ISSN: 1063-7834
    E-ISSN: 1090-6460
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