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  • 75.70.Cn  (1)
  • Optical properties  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Separation of interface and bulk contributions in second-harmonic generation from magnetic and non-magnetic multilayers (1995)
    Springer
    Applied physics 60 (1995), S. 103-111 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.65.Ky ; 75.70.Cn ; 78.66.-w
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract We discuss the separation problem of bulk vs interface contributions in optical Second-Harmonic Generation (SHG). A new method is presented, which — in special cases — provides a full separation of all interface and bulk tensor components. The method is based on measurements in a thin-film geometry, and the relation between two bulk tensor components obtained from group-theoretical arguments. The separation problem in its strict sense is shown to be absent in Magnetization-induced SHG (MSHG). Though, in practice, also in the MSHG case interface and bulk contributions can be closely resemblant. The approach is illustrated by second-harmonic experiments on C60 thin films. SHG in this system is found to be completely dominated by bulk processes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01538233
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Exact diagonalization results for multimagnon IR absorption in the cuprates (1995)
    Springer
    Journal of superconductivity 8 (1995), S. 567-570 
    Details
    ISSN: 1572-9605
    Schlagwort(e): Antiferromagnetism ; Optical properties ; Heisemberg model
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00727427
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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