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  • 1995-1999  (6)
  • 1998  (6)
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  • 1995-1999  (6)
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  • 1
    Electronic Resource
    Electronic Resource
    Influence of the real shape of a sample on the pinning induced magnetostriction (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3770-3775 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The pinning induced magnetostriction in an isotropic superconductor was calculated for different sample shapes. We analyzed some special shapes for which the solution can be found analytically. The magnetostriction of a finite slab was considered. In order to determine the influence of demagnetization effects, the pinning induced magnetostriction of an infinitely long and thin strip was calculated. A simple, approximate formula can be used in particular cases to analyze the magnetostriction induced by pinning forces. In this formula the magnetostriction of a sample is connected directly with its magnetization. We also present some experimental results on high temperature superconductors which are analyzed in frames of the developed theory. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368555
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Growth-induced anisotropy in Ba0.6K0.4BiO3 superconducting single crystal (1998)
    Springer
    Applied physics 67 (1998), S. 413-416 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 74.25.Ha; 74.62.Bf; 74.62.Dh; 74.72.Yg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 0.6 K0.4BiO3 single crystal have been performed to study the nature of the growth-induced anisotropy revealed using chemical etching technique. It was found that this anisotropy is responsible for differences in low-field susceptibility and in hysteresis loops observed for different magnetic field orientations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050795
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Low-temperature structural phase transition in a monoclinic KDy(WO4)2 crystal (1998)
    Springer
    Physics of the solid state 40 (1998), S. 691-698 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The low-temperature thermal and magnetic-resonance properties of a monoclinic KDy(WO4)2 single crystal are investigated. It is established that a structural phase transition takes place at T c=6.38 K. The field dependence of the critical temperature is determined for a magnetic field oriented along the crystallographic a and c axes. The initial part of the H-T phase diagram is plotted for H∥a. The prominent features of the structural phase transition are typical of a second-order Jahn-Teller transition, which is not accompanied by any change in the symmetry of the crystal lattice in the low-temperature phase. The behavior of C(T) in a magnetic field shows that the transition goes to an antiferrodistortion phase. An anomalous increase in the relaxation time (by almost an order of magnitude) following a thermal pulse is observed at T〉T c(H), owing to the structural instability of the lattice. A theoretical model is proposed for the structural phase transition in a magnetic field, and the magnetic-field dependence of T c is investigated for various directions of the field.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130382
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetostriction of the spin-Peierls magnet CuGeO3 (1998)
    Springer
    Physics of the solid state 40 (1998), S. 1520-1522 
    Details
    ISSN: 1063-7834
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The temperature dependence of the longitudinal magnetostriction of a CuGeO3 single crystal is measured within the temperature range 4.2–20 K in a magnetic field of 10 T. As the temperature is raised above 4.2 K, the magnetostriction at first increases from vanishingly small values, attains a maximum at a temperature of approximately 12 K, and then abruptly drops as the temperature approaches the spin-Peierls transition. The results are interpreted on the basis of a simple model utilizing the real pattern of magnetic excitations in the spin system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.1130590
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic and resonance properties of LiCu2O2 single crystals (1998)
    Springer
    Journal of experimental and theoretical physics 86 (1998), S. 1020-1025 
    Details
    ISSN: 1090-6509
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We study the structural, magnetic, and resonance properties of LiCu2O2 single crystals grown by the spontaneous crystallization method. The data are interpreted on the assumption that the crystalline structure of the grown single crystals is orthorhombic. Long-range antiferromagnetic order sets in at temperatures below 22.5 K, while above this temperature the dependence of the magnetic susceptibility has a shape characteristic of interacting antiferromagnetic Heisenberg chains. We hypothesize that long-range magnetic order sets in below 22.5 K through the destruction of the ideal ladder structure of LiCu2O2 because of partial redistribution of copper and lithium ions at the crystal lattice sites and because of the presence of other defects in the crystalline structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1134/1.558548
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic Ordering of Dy3+ Ions in RbDy(WO4)2 Single Crystal (1998)
    Springer
    Journal of low temperature physics 110 (1998), S. 1003-1011 
    Details
    ISSN: 1573-7357
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The specific heat C(T) of the monoclinic RbDy(WO 4 ) 2 crystal has been studied at very low temperatures 0.2≤T≤1.9 K and in magnetic fields 0≤H≤0.38 T. The Neel temperature was shown to be equal to TN = 0.818 ± 0.005 K. The experimental value of the effective exchange parameter was obtained to be equal to J/k = − 0.798 K. The C T) dependence below Neel temperature 0.5TN〈T〈0.99TN ) is well described by 2D Ising model, whereas in the temperature region close above TN (1.01 TN〈T〈 2TN) it can be described by neither 2D, nor 3D Ising model. The experimental and theoretical H-TN diagrams for field H ‖ a are in a reasonable agreement for simple quadratic lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022308115255
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