Abstract
The frequency-dependent c-axis conductivity, σ c ( ω), is calculated using a periodic bilayer model of antiferromagnetically ordered spins, with one bilayer per unit cell. The spin-fluctuation gating mechanism, proposed earlier only for acoustic magnons, yields now a weakly frequency-dependent low-frequency interval followed by a steep rise in σ c ( ω), as a function of ω, a kind of shoulder. This theoretical prediction for σ c ( ω) can be associated with the experimentally observed “pseudo-gap” phenomenon in the underdoped YB 2Cu 4O 8 high T c crystal.
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