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  • Antiferromagnetism  (2)
  • Optical properties  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Exact diagonalization results for multimagnon IR absorption in the cuprates (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 567-570 
    Details
    ISSN: 1572-9605
    Keywords: Antiferromagnetism ; Optical properties ; Heisemberg model
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Recent measured bands in the mid IR of parent insulating compounds of cuprate superconductors [Perkins et al. Phys. Rev. Lett.71 1621 (1993)] are interpreted as multimagnon infrared (IR) absorption assisted by phonons. We present results for the coupling constant of light with this excitations and exact diagonalization results for the spectra and compare with interacting spin wave theory. The observed structures correspond to the absorption of one phonon plus two magnons and one phonon plus higher multimagnon absorption processes. Our results imply that IR absorption can be used as a unique probe of quantum antiferromagnetic systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727427
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Two-magnon excitations in cuprates and nickelates (1996)
    Springer
    Journal of superconductivity 9 (1996), S. 389-392 
    Details
    ISSN: 1572-9605
    Keywords: Antiferromagnetism ; optical properties ; Heisenberg model ; cuprates ; nickelates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract We discuss two-magnon phonon-assisted infrared absorption in two-dimensional Heisenberg systems like the parent insulating high-T c cuprates (spin 1/2) and nickelates (spin 1). The theoretical line shape is compared with experiments. In the case of the cuprates it explains the mid-infrared peaks observed in the insulator. In the case of the nickelates the predicted line shape is also shown to agree with the experiments. We discuss the possibility to observe these excitations in other experiments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00727283
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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