Disordered, Low Energy Component of the Magnetic Response in Both Antiferromagnetic and Superconducting Y-Ba-Cu-O Samples

摘要: Neutron scattering lends itself as a prominently powerful and direct tool to the investigation of magnetic phenomena, under assumption that effects can be unambiguously identified separated from an often stronger background non-magnetic signal. This is case in particular with relatively small effects, such high Tc superconductors. Magnetic Bragg peaks excitations around them well by their localized character reciprocal space. On other hand, hardly q dependent diffuse disorder only use polarization analysis, which implies dramatic loss neutron intensity, i.e. sensitivity. latter kind, much more limited studies performed now are complementary single crystal work described contributions this volume they provide evidence for existence type, low frequency range contribution total response Y-Ba-Cu-O compounds. “impurity” kind magnetism expected also manifest µSR NMR experiments.