Transverse and longitudinal magnetoresistances of Tl1−xErxBa2Ca2Cu3O9−δ in weak magnetic field

Abstract Measurements of transverse and longitudinal magnetoresistances of Tl 1− x Er x Ba 2 Ca 2 Cu 3 O 9− δ ( x =0–0.3) in weak magnetic field up to 5 kG at different temperatures ranging from 77.5 to 294 K are reported. Our results show that the transverse magnetoresistance values are higher than those in the case of longitudinal one for superconductor samples ( x ⩽0.2). A more negative magnetoresistance is observed in the longitudinal case than in the case of transverse for semiconductor sample ( x =0.3).