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  • Articles: DFG German National Licenses  (68)
  • 1
    Electronic Resource
    Electronic Resource
    Unidirectional pinning in irradiated Bi2Sr2CaCu2O8 (invited) : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6322-6327 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Bi2Sr2CaCu2O8 crystals were irradiated with heavy ions (Pb, Xe) to produce columnar defects along the c direction or at 45° with respect to it. We describe the dependence of the critical currents, irreversibility fields, pinning force, and magnetic relaxation rates on the dose and on the type of ions. The irreversible properties of the Pb-irradiated samples are more enhanced than those of the Xe-irradiated sample at low temperatures, and vice versa at high temperatures. At low temperatures the efficiency of the columnar defects is enhanced with the ion dose but, at high temperatures, the maximum dose (2.5×1011 ions/cm2) is less efficient than intermediate doses. The unidirectional nature of the columnar pinning centers serves to demonstrate that the vortices maintain linelike features. For most of the irradiated samples, the pinning force density data are reduced to a single curve below 45 K. The relaxation rates at low temperatures reflect thermal reduction of the effective pinning barriers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355388
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  • 2
    Electronic Resource
    Electronic Resource
    Local ac magnetic response in type-II superconductors (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7621-7623 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present an analysis of the local ac magnetic response in type-II superconductors as measured by a miniature Hall probe. The results show that the response is a function of the position of the probe even in a homogeneous sample. The local response in an inhomogeneous sample is further influenced by local variations of superconducting properties across the sample. Applications of this analysis in characterizing and mapping of inhomogeneities in a sample are illustrated. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357930
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic relaxation and critical current in an YBaCuO crystal (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5797-5799 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have measured the temperature dependence of magnetic relaxation and critical current in an YBaCuO single crystal. Unusually strong time-logarithmic magnetic relaxation is observed. The relaxation rate increases initially with temperature, peaks at (approximately-equal-to)25 K and slows down at higher temperatures. The results, interpreted with a thermally activated flux model, yield a low-temperature pinning energy U0(approximately-equal-to)0.02 eV. This low pinning energy results in an unusually rapid decrease of the critical current as temperature is increased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342208
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  • 4
    Electronic Resource
    Electronic Resource
    Shear strength of shock-loaded alumina as determined with longitudinal and transverse manganin gauges (1987)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 62 (1987), S. 1120-1122 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The shear strength of shock-loaded commercial alumina (AD-85 manufactured by Coors) is determined in the 0–140-kbar range of shock stresses. Longitudinal and transverse manganin gauges were used to determine the principal stresses in the shocked specimens. Shear strengths were determined from the difference between the longitudinal and lateral stresses. It was found that the shear strength remains essentially constant at about 27 kbar for shock stresses between 60 kbar (the Hugoniot elastic limit) and the maximum shock amplitude tested in this series (142 kbar). The source for the high shear strength is attributed to the confining pressures that strengthen the comminuted ceramic. Evidence for this interpretation is obtained by considering the release profiles as recorded by the longitudinal gauges when the free-surface rarefactions reach gauge location.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.339721
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  • 5
    Electronic Resource
    Electronic Resource
    New glassy features in high-Tc superconductors (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4182-4184 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic measurements on a high-Tc superconductor YBa2Cu3O7 reveal new spin-glass-like features. At low temperatures and low fields the irreversible part of the field-cooled magnetization Mirr rotates with the sample as a rigid entity. The rigidity is broken and part of Mirr disappears above an angle φ* which decreases with increasing temperature or field. This behavior resembles that of spin glasses and differs qualitatively from the behavior found for Nb.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340243
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of the dynamic response of AD-85 alumina with in-material Manganin gauges (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 58 (1985), S. 3077-3080 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Plate impact experiments were performed on commercial alumina disks (AD-85, manufactured by Coors), with in-material Manganin gauges, in order to determine the dynamic response of this material in the 0–100 kb range. The measured stress signals showed that the transmitted waves, at the high stress range, are composed of an initial elastic jump, to about 60 kb, followed by a dispersive rise to the final stress level. This behavior was found recently for pure alumina but not for AD-85. We used the gauges to determine the Hugoniot curve of AD-85 in the 0–100 kb range and its spall strength in this region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335807
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  • 7
    Electronic Resource
    Electronic Resource
    Hall-array gradiometer for measurement of the magnetic induction vector in superconductors (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5471-5473 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An experimental technique for measuring the distribution of the normal and planar components of the magnetic induction near the surface of a superconducting sample is described. This technique utilizes a design of a double-layered Hall sensor array fabricated from a GaAs/AlGaAs heterostructure containing two parallel layers of a two-dimensional electron gas. Applications of this technique are demonstrated in measuring the current density distribution and in characterizing the flux creep process in a thin YBa2Cu3O7 crystal. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369865
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  • 8
    Electronic Resource
    Electronic Resource
    Annealing study of Fe2O3 nanoparticles: Magnetic size effects and phase transformations (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 4611-4616 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sonochemically synthesized Fe2O3 nanoparticles were annealed in air or in vacuum while their magnetization was continuously recorded. Annealing in vacuum at temperatures Ta between 240 and 450 °C produced nanophases of γ-Fe2O3 with average particle size ranging from 4 to 14 nm, depending on Ta. Phase transformation into α-Fe2O3 occurred directly by annealing in air, or via an intermediate Fe3O4 phase by annealing in vacuum at temperatures higher than 450 °C. Mapping the correlation between the magnetic properties and the annealing conditions, enables control of the annealing process to obtain nanocrystals of γ-Fe2O3, α-Fe2O3, or Fe3O4 with different particle size and magnetic properties. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1457544
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  • 9
    Electronic Resource
    Electronic Resource
    Bean–Livingston barriers and first field for flux penetration in high-Tc crystals : The 5th Joint MMM−Intermag Conference (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 5759-5761 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present evidence for the importance of Bean–Livingston (BL) barriers for field penetration into high-Tc crystals. The magnetization curves M(H) and the first field Hp for flux penetration were measured near the transition temperature Tc of untwinned Y-Ba-Cu-O crystal by using a miniature Hall probe. There are three observations that serve as evidence for the efficiency of BL barriers: (1) the magnetization was found to be almost zero on the descending branch of the magnetization loop; (2) The slope of Hp(T) exhibits a clear change close to Tc, being largest at Tc; (3) after introducing damage by irradiating the sample, both the field Hp and the width of the M(H) loops reduce significantly, showing almost reversible behavior for the sample. We explain these observations in terms of BL barriers which are shown to be especially important in high-Tc superconductors, and these could be responsible for the controversy of the Hc1 values reported previously in the literature.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.350152
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  • 10
    Electronic Resource
    Electronic Resource
    Flux-flop in high temperature superconducting crystals with columnar defects : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 5862-5864 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Measurements of magnetization curves of Y-Ba-Cu-O crystals with columnar defects reveal pronounced peaks around H=0 for applied fields not parallel to the defect direction. The magnitude and direction of the remanent magnetization are independent of the direction of the applied field for a large range of angles. We show that the unidirectional character of the defects induces, in the low field limit, a flux-flop from a direction determined by the field to the defect direction. Implications to planar pinning are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353553
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