Magnetic correlations in YBa2Cu3O6+x at superconducting concentrations.

摘要: Neutron-scattering measurements have been carried out on three large single crystals of YBa{sub 2}Cu{sub 3}O{sub 6+{ital x}} with superconducting transition temperatures {ital T}{sub c}}=25, 45, and 50 K. Strong two-dimensional magnetic correlations are found in the first two, cross sections at low almost as strong compounds smaller x}. However, intensities energies below 10 meV decrease considerably heating to 300 A inelastic section was observed third sample ({ital c}}=50 K) relative two these energies. The implications results discussed.