Journal
JETP LETTERS
Volume 87, Issue 7, Pages 371-375Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0021364008070084
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Experimental data on the non-spin-wave behavior of the cuprate magnetic susceptibility chi(q, omega) in the superconducting state are reconstructed on the basis of a spherically symmetric self-consistent approach within the framework of the frustrated Heisenberg model. For the Green's function of the spin-wave excitations, a polarization operator resonant with the superconducting state is introduced phenomenologically. This gives rise to an additional (compared to the normal state) branch of the incommensurate peaks and to a pronounced non-spin-wave behavior of the susceptibility chi(q, omega) in the frequency range near 80 meV (the so-called dark region). The renormalization of the real part of the polarization operator plays a crucial role in the theory.
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