Antiparamagnons and anomalies of the tunnel density of states in YBaCuO

We consider changes of the spectra of single-particle excitations in superconducting CuO2 layers and in CuO chain layers, brought about by the mutual influence of superconducting pairing and magnetic fluctuations. The effect of two-dimensional antiferromagnetic fluctuations in the layers that contain the CuO chains on the tunnel characteristics of YBaCuO is considered. The calculated theoretical curves of the tunnel density of states demonstrate a qualitative agreement with experimental data.