Phenomenological approach to the non-spin-wave behavior of cuprate magnetic susceptibility in the superconducting state

摘要: Experimental data on the non-spin-wave behavior of cuprate magnetic susceptibility χ(q, ω) in superconducting state are reconstructed basis a spherically symmetric self-consistent approach within framework frustrated Heisenberg model. For Green’s function spin-wave excitations, polarization operator resonant with is introduced phenomenologically. This gives rise to an additional (compared normal state) branch incommensurate peaks and pronounced frequency range near 80 meV (the so-called “dark region”). The renormalization real part plays crucial role theory.