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[en] One potential objection to virtual sandwich excitons as a pairing mechanism is that the transition densities αe* (rvec x)βh(rvec X) may not be large enough to overcome the inherent disadvantage of a large energy denominator hω0. In model calculations, the authors of this paper find that some of the transition densities and matrix elements can be large even if the dielectric constant is sizeable for, e.g., LaO excitons in La2-xSrxCuO4
Source
Christen, D. (Oak Ridge National Lab., Oak Ridge, TN (United States)); Narayan, J. (North Carolina State Univ., Raleigh, NC (United States)); Schneemeyer, L. (AT and T Laboratories, Murray Hill, NJ (United States)); 1322 p; ISBN 1-55899-057-7; 
; 1990; p. 33-36; Materials Research Society; Pittsburgh, PA (United States); Materials Research Society fall meeting; Boston, MA (United States); 27 Nov - 2 Dec 1989; CONF-891119--; Materials Research Society, 9800 McKnight Rd., Suite 327, Pittsburgh, PA 15237 (USA)
; 1990; p. 33-36; Materials Research Society; Pittsburgh, PA (United States); Materials Research Society fall meeting; Boston, MA (United States); 27 Nov - 2 Dec 1989; CONF-891119--; Materials Research Society, 9800 McKnight Rd., Suite 327, Pittsburgh, PA 15237 (USA)