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  • 1995-1999  (6)
  • 1980-1984
  • 1950-1954
  • 1996  (6)
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  • 1995-1999  (6)
  • 1980-1984
  • 1950-1954
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Ultrafast optical switching of second-harmonic generation at the C60 single-crystal surface (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 3781-3783 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The switching of second-harmonic generation (SHG) at a C60 single-crystal surface has been observed in a pump-and-probe experiment. The SHG signal from a picosecond 1.17 eV laser pulse is suppressed by one order of magnitude upon illuminating the crystal surface with a 3.49 eV pump pulse. The nonlinear optical response is faster than 45 ps and persists for longer than 20 ns. SHG suppression to 1/e occurs at pump densities as low as 2.8 μJ/cm2. We suggest that nonlocalized excited electronic states determine the change in the nonlinear optical behavior. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361213
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chemical inhomogeneity and reactions of BiSrCaCuO surfaces detected by synchrotron imaging spectromicroscopy (1996)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 69 (1996), S. 2924-2926 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A microscopic chemical analysis of BiSrCaCuO (BSCCO) 2212 single crystals was performed with an unprecedented combination of high (submicron) lateral resolution and high energy resolution (100 meV or better). These performances, achieved with imaging synchrotron spectromicroscopy, enabled us to detect in a very small fraction of the investigated specimens, morphological and chemical inhomogeneities. Specifically, we found deviations from stoichiometry in the surface Sr content which have a subtle effect on the chemical environment of at least one other element, Ca. The different chemical environment was found to influence surface chemical reactions. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.117325
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Time-dependent changes of insufficiency fractures of the sacrum: intraosseous vacuum phenomenon as an early sign (1996)
    Springer
    European radiology 6 (1996), S. 655-657 
    Details
    ISSN: 1432-1084
    Keywords: Computer tomography ; Insufficiency fracture ; Sacral bone ; Vacuum phenomenon
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Sacral insufficiency fractures develop over a period of time and show time-dependent changes. We report on 15 CT examinations of 5 patients with early-stage insufficiency fractures of the sacrum. In 4 patients only irregular sclerosis without distinct fracture lines was present in 7 of 8 fractures. Of these 4 patients; 3 exhibited intraosseous gas inclusions in a ventral part of a lateral mass; 5 of 8 fractures disclosed a ventral cortical break. When distinct fracture lines had developed in 1 patient, intraosseous vacuum phenomenon had disappeared. Fracture lines evolve over weeks to months and show central bone absorption. The fractures can heal as demonstrated in 4 of 6 fractures in 3 patients, can persist over 1 year without significant changes or can progress to pseudoarthrosis with bone destruction similar to neuropathic joint disease. Intraosseous vacuum phenomena can persist to this stage. Intraosseous vacuum phenomenon is recognized as a potential finding in the early stage of sacral insufficiency fracture, which also is true for irregular sclerosis and ventral cortical disruption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00187667
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Morphology of growth of Bi2Sr2CaCu2O8 single crystals (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1529-1534 
    Details
    ISSN: 1573-7357
    Keywords: 74.62.Bf ; 74.25.Gz ; 74.72.Hs.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A good correlation of twins on the basal surface of flux-grown Bi2Sr2CaCu2Ox (BSCCO) single crystals with surface. growth steps is observed, the b-axis being perpendicular to the steps and, thus, parallel to the growth direction. It is found that mono-twin BSCCO single crystals produced by the travelling solvent floating zone method also grow preferentially along b, i.e. nearly perpendicularly to the boule axis, contrary to the common belief. This new understanding of the morphology of growth explains the nature of major defects in these crystals, which considerably change their measured superconducting properties, in a different way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753917
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Pinning in BSCCO above the ordinary irreversibility line (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 1117-1122 
    Details
    ISSN: 1573-7357
    Keywords: 74.60.Ec ; 74-60.Ge ; 74.25.Dw ; 74.72.Hs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Frequency-dependent observations of magnetic flux structures are used to show that pinning plays a principal role in the whole mixed state in Bi2Sr2CaCu2O8 (BSCCO) single crystals. We speculate that the random pinning force on the moving vortices may dominate over thermal fluctuations and considerably modify the position of the vortex lattice phase transition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00753849
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic Raman scattering in CuO2 superconductors (1996)
    Springer
    Journal of low temperature physics 105 (1996), S. 733-742 
    Details
    ISSN: 1573-7357
    Keywords: 78.30 Er ; 74.72 Hs ; 74.25 Gz
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Experimental results for the electronic Raman effect in differently doped cuprate superconductors will be presented. We show that the B2g-symmetry data are generally closely related to ordinary transport and are therefore most likely originating from the carriers, while the response at B1g symmetry cannot be assigned to a specific type of excitations. In the superconducting state the B2g pair breaking peaks scale with the transition temperature over a wide doping range. All results consistently suggest a strong anisotropy of the gap and can be modeled by assuming $$d_{x^2 - y^2 }$$ symmetry for the order parameter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00768471
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    Paper (German National Licenses)
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