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VOLUME 58 (1993) | ISSUE 4 | PAGE 291
Anomaly on the temperature dependence of the Hall resistance in semiconducting YBa2Cu3O6+x films
The Hall effect has been studied in semiconducting õ÷Á2óÉÚ06+È films under equilibrium conditions and also after illumination with visible light. A rounded maximum is observed on the temperature dependence of the Hall resistance, Rxy(T). This anomaly shifts down the temperature scale as the density of free carriers increases, because of an increase in the oxygen content χ and also because of a photoexcitation of mobile holes (a frozen photoconductivity). It is suggested that the maximum observed on the Rxy(T) curves stems from the appearance of an antiferromagnetic order.