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VOLUME 60 (1994) | ISSUE 2 | PAGE 118
Spectrum of elementary excitations and interplanar tunneling in layered cuprates
Data on photoelectron emission obtained recently with a resolution better than 10 meV can be described well by the model of a singlet-correlated motion of oxygen holes in Cu02 planes. This model predicts the existence of a peak in the density of states near the bottom of the band. Experimental points corresponding to an energy of 120 meV near the center of the Brillouin zone in YBa2Cu408 are explained on the basis of an interplanar tunneling of singlet-correlated oxygen holes.