The Interplay of the Charge and Vortex Subsystems in Anisotropic Electron-Doped Superconductor Nd2-xCexCuO4

This paper presents the results of studies of the temperature and field dependences of the resistivity tensor of the electron-doped superconductor Nd2 -xCexCuO4 (0.12 <= x <= 0.20) in the CuO2 conducting planes and in the direction perpendicular to the CuO2 planes. These results are successfully interpreted within the concept of quasi-two-dimensionality of the systems with high metallic conductivity in the CuO2 conducting planes (d rho(ab)/dT > 0) and nonmetallic temperature dependence of conductivity in the direction of the c-axis (d rho(c)/dT < 0) due to incoherent tunneling and thermal activation through barriers between the CuO2 conducting layers. The specificities of the behavior of the magnetoresistivity rho(xx)(B) and the Hall resistivity rho(xy)(B) in the mixed (resistive) state are associated with the dynamics of the transverse motion of Abrikosov and Josephson vortices in the flux flow regime in crossed electric and magnetic fields.