Hall effect studies in YBCO films

Анотація

The longitudinal, rho_xx(T), transverse, rho_xy(T), and Hall, rho_H(T) resistivities have been measured for YBa₂Cu₃O_x (YBCO) films, showing positive resistivity buckling and those with usual linear rho_xx(T) dependence. In the former case unexpected peak on rho_xy(T) and unusual rho_H(T) dependence with double sign change just above transition temperature T_c have been revealed. The data are analyzed using recent theory for the sign of the Hall conductivity in strongly correlated systems.