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  • 43.20f  (1)
  • 75.10  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Longitudinal resonant spectrophone for CO-laser photoacoustic spectroscopy (1987)
    Springer
    Applied physics 44 (1987), S. 125-132 
    Details
    ISSN: 1432-0649
    Keywords: 07.65b ; 43.20f ; 43.85e
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A photoacoustic (PA) system for monitoring gaseous air pollutants absorbing in the CO-laser range is presented. The characteristics of the CO laser and the interference caused by water-vapor absorption demand a special design of the PA cell and experimental setup. The optimum cell design was found by numerical simulation of the acoustic properties of various cell geometries. For this purpose a model using infinitesimal analogue acoustic impedances was developed. Based on a matrix formalism for fourterminals, a computer program was applied that permits the calculation of the frequency response of the PA signal amplitude at any position within a one-dimensional PA cell. Excellent agreement with experimental data is obtained. As a result, a new design for an acoustically resonant spectrophone with improved properties is presented. The response of the cell with aQ-factor of 52, operated at 555 Hz, is 2000 Pa cm/W.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694205
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  • 2
    Electronic Resource
    Electronic Resource
    Cuprates intermediate between one and two dimensions (1994)
    Springer
    Journal of low temperature physics 95 (1994), S. 299-308 
    Details
    ISSN: 1573-7357
    Keywords: 75.10 ; 74.20 ; 74.72
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The key elements in all known cuprate superconductors are lightly doped CuOi-planes. Recently a new homologous series of compounds Srn−1Cun+1O2n have been reported in which the planes contain a parallel array of line defects which form a trellis lattice with ladder-segments of the square lattice weakly coupled through triangular line defects. The width of the ladder segments is determined by the parameter n and varies from single chains to arbitrarily wide ladders. The magnetic properties of undoped compounds will be dominated by the properties of the ladders. Heisenberg s = 1/2 ladders can have a spin liquid groundstate with a spin gap if the number of rungs is odd so that a short range RVB groundstate is predicted for such trellis lattices. Using a t-J model to describe the doped material leads to the prediction of a d-wave RVB superconducting groundstate with a large spin gap.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00754945
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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