Abstract
The longitudinal, ρxx(T), transverse, ρxy(T), and Hall, ρH(T) resistivities have been measured for YBa2Cu3Ox (YBCO) films, showing positive resistivity buckling and those with usual linear ρxx(T) dependence. In the former case unexpected peak on ρxy(T) and unusual ρH(T) dependence with double sign change just above transition temperature Tc have been revealed. The data are analyzed using recent theory for the sign of the Hall conductivity in strongly correlated systems.
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