When a magnetic field is applied parallel to the superconducting layers in high-Tc superconductors (HTSCs), vortices become Josphson vortices (JVs). To study the magnetic phase diagram of JVs in strongly anisotropic HTSCs, we propose that the JV flow-resistance measurement is a powerful probe to observe periodic oscillations in the JV flow-resistance against the magnetic field. We could determine the magnetic phase diagram of JVs in Bi -2212, in which there exist a three-dimensionally-ordered state and a two-dimensionally quasi-ordered one.
Oscillations of Josephson-vortex flow resistance in high-Tc superconductors