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  • 1
    Electronic Resource
    Electronic Resource
    Paraelectric resonance of centers with icosahedral symmetry (1997)
    Springer
    Physics of the solid state 39 (1997), S. 1512-1517 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The paraelectric resonance spectrum of non-central impurity ions situated in crystal fields of icosahedral symmetry is predicted. A multiwell potential is considered that corresponds to the displacement of the ions from the center of symmetry toward the vertices of the icosahedron, the faces of a dodecahedron, and the pentagonal faces of a fullerene molecule. The effective Hamiltonian of endohedral complexes in external electric fields with arbitrary orientation is obtained, its eigenvalues are found, and the line intensities of different transitions between the tunnelling levels are calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130125
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  • 2
    Electronic Resource
    Electronic Resource
    Characteristics of the temperature dependence of the EPR spectrum of a layered GaSe:Gd crystal (1998)
    Springer
    Physics of the solid state 40 (1998), S. 55-56 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the axial constants b 2 0 characterizing the fine structure of the EPR spectra of Gd3+ in a layered GaSe crystal is investigated. The compound GaSe:Gd contains three types of centers, in which Gd3+ is associated with Li+ or Na+ ions situated in the interlayer space. The influence of these ions on the phonon spectrum of the crystal is studied. It is shown that the lithium atoms are too small to have any appreciable influence on low-frequency optical vibrations (the E″ mode), which govern the behavior of the temperature curve. Here b 2 0 (T) remains linear in the temperature range well below the Debye temperature ΘD; this is a characteristic feature of layered structures. Sodium, on the other hand, completely suppresses the E″ mode, so that, for centers associated with it, the temperature dependence of b 2 0 (T) exhibits the same behavior as for ordinary (nonlayered) crystals, where linearity is observed only for T〉ΘD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130231
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  • 3
    Electronic Resource
    Electronic Resource
    Multiwell potentials of endohedral complexes of icosahedral symmetry (1998)
    Springer
    Journal of experimental and theoretical physics 87 (1998), S. 123-132 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We examine multiwell potentials that correspond to the displacements of off-center ions in complexes with icosahedral symmetry (dodecahedrons, icosahedrons, fullerenes, etc.) along symmetry directions (toward vertices, midpoints of edges, and centers of faces). An expression is derived for an effective Hamiltonian, which describes the behavior of endohedral complexes with off-center ions placed in external electric fields of arbitrary strength and orientation. We find the eigenvalues of this Hamiltonian and calculate the intensities of the lines of all possible transitions between tunneling levels. We also predict and analyze the spectra of paraelectric resonances in the absence of an external static electric field (zero-field resonances) and in the presence of such a field. Finally, we provide recommendations for detecting these effects and discuss the specific features of the effects and the possibility of studying them.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558633
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  • 4
    Electronic Resource
    Electronic Resource
    The low-temperature electric conductivity of YBaCuO and LaSrMnO dielectric films obtained by a pulsed laser sputter deposition technique (2000)
    Springer
    Technical physics letters 26 (2000), S. 903-906 
    Details
    ISSN: 1090-6533
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the electric conductivity of YBaCuO and LaSrMnO dielectric films obtained by pulsed laser sputtering of targets possessing metallic conductivity. The plots of the sample resistance versus temperature R=R(T) measured at T〈T cr(T cr=160–240 K) exhibit regions where R is independent of the temperature. This phenomenon is probably related to manifestations of the quantum confinement effects upon the conversion of small grains into quantum dots. In the region of T〈T cr, the electric conductivity of the system is determined by a mechanism of the phononless electron tunneling with participation of the atomic-type states belonging to small grains (clusters) featuring metallic conductivity in the amorphous matrix.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1321234
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  • 5
    Electronic Resource
    Electronic Resource
    Lake Baikal neutrino experiment: Selected results (2000)
    Springer
    Physics of atomic nuclei 63 (2000), S. 951-961 
    Details
    ISSN: 1063-7788
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review the present status of the Lake Baikal neutrino experiment and present selected physics results obtained during the consecutive stages of the stepwise upgrade of the detector: from NT-36 to NT-96. The results cover atmospheric muons, neutrino events, neutrinos of very high energy, searches for neutrino events from WIMP annihilation, searches for magnetic monopoles, and environmental studies. We also describe an air Cherenkov array developed for studying the angular resolution of NT-200.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.855731
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  • 6
    Electronic Resource
    Electronic Resource
    Quantum particle in a box with moving walls (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 3391-3404 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: The analytical expressions for the energy gain and transition probabilities between energy levels of a nonrelativistic quantum particle confined in a box with uniformly moving walls, including the cases of adiabatic motion and a sudden change of the size of the box was obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530083
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum phenomena in resonators with moving walls (1993)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 34 (1993), S. 2742-2756 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: New solutions for the mode functions of the electromagnetic field in ideal cavity which boundary oscillates at a resonance frequency are obtained in the long-time limit. The rate of photons creation from initial vacuum state is shown to be time independent and proportional to the amplitude of oscillations and the resonance frequency. Temperature corrections are evaluated. The squeezing coefficients for the quantum states of the field generated are calculated, as well as the backward reaction of the field on the vibrating wall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.530093
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  • 8
    Electronic Resource
    Electronic Resource
    Exact evolution equations for SU(2) quasidistribution functions (2002)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 43 (2002), S. 2202-2213 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: We derive an exact (differential) evolution equation for a class of SU(2) quasiprobability distribution functions. Linear and quadratic cases are considered as well as the quasiclassical limit of the large dimension of representation, S(very-much-greater-than)1. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1463711
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  • 9
    Electronic Resource
    Electronic Resource
    Scanning tunneling microscope calibration and reconstruction of real image: Drift and slope elimination (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1551-1557 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Drift, slope of sample, and indeterminate sensitivity of piezoceramics are considered as the origin of the linear scanning tunneling microscope (STM) image distortions. A special algorithm of STM scanning and reconstruction of image of unknown atomic structures is suggested and tested. This algorithm allows us to measure three components of the drift velocity and two angles, characterizing the average slope of scanning surface. On the one hand, using this algorithm, one can perform the STM calibration by a known surface structure (for example, the highly oriented pyrolytic graphite surface) even in the presence of a drift. This enables us to determine all the three piezoceramics constants of STM piezoscanner and the deviation of the real scanner axes X and Y from orthogonality. On the other hand, using such a calibrated STM and the described algorithm, it is possible to obtain the real STM image and make measurements for unknown surfaces with atomic resolution without the distortions mentioned above. As it has been proved, the error of interatomic distance measurements does not exceed 5% (∼0.1 A(ring)) for any direction along the surface, even in the presence of a drift up to 0.4 A(ring)/s and the sample slope angle up to 10°.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144890
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  • 10
    Electronic Resource
    Electronic Resource
    Compact bath cryostat filled with liquid helium inside an ordinary storage Dewar (2001)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 72 (2001), S. 3723-3725 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An economical bath cryostat for optical and galvano-magnetic measurements is described. The small overall diameter of the cryostat allows filling with liquid helium directly upon immersion into an ordinary storage Dewar vessel. As a result, it needs no more than 0.2 l of liquid helium for a single cycle of low-temperature measurements outside the storage Dewar lasting 1.5–4 h. Simplicity and low cost are other advantages of the cryostat. The basic ideas used in this device are the mobility of a helium can relative to the external body of the cryostat and the essential increase of the helium boiling point if pressure increases up to 0.5–1.5 atm over atmospheric pressure. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1394177
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