In the high temperature superconductor La1.85 Sr0.15 Cu1 - y Zny O4, we directly observed modulated antiferromagnetic correlations of Cu spin orientations via elastic (y = 0.02) and low energy inelastic (y = 0.004) magnetically scattered neutron intensity. A magnetic field was applied perpendicular to the CuO2 plane to change these correlations. For y = 0.02 we confirmed an earlier observation of elastic scattered intensity at 2 K and 0 T. The component of the magnetic moment perpendicular to the scattering vector is μ⊥ Q < 0.065 μB, and is enhanced by 32% when a 5.5 T field is applied. For y = 0.004, we observed a 145% enhancement of 3 meV spin excitations when a 14.5 T magnetic field is applied at 1.6 K. However, we observed no elastic scattered intensity at either 0 or 14.5 T.
- High temperature superconductivity
- Magnetic field
- Magnetic neutron scattering
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Electrical and Electronic Engineering