Study on local magnetic flux distribution in type II superconductors by means of small-angle neutron scattering

Small angle neutron scattering measurements are performed to investigate the local magnetic flux distributions in type II superconductors. Two types of superconducting crystals are used in the experiments, a cylinder-shaped Nb single crystal and a Bi2212 oxide single crystal. Results show that regular arrangement in the magnetic flux lines occurs under high magnetic fields rather than under the critical field.