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The longitudinal ρ xx and Hall resistivity ρ xy of Y 0.8 Ca 0.2 Ba 2 Cu 3 O 7−δ thin film were measured in different magnetic fields up to 10.0T. The anomalous sign reversal and a second sign reversal were observed in the overdoped sample. A scaling law, ρxy∝ρxxβ with β=1.7±0.1, was determined for the field above 1T. The experimental results...
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