Hall effect studies of the mixed and normal states of Y 1−xPr xBa 2Cu 3O 7−δ(0 ≤ x ≤ 1) and YBa 2Cu 3O y (6.35 ≤ y ≤ 7) single crystals

Abstract

Hall effect measurements on single crystal specimens of Y 1−xPr xBa 2Cu 3O 7−δ(0 ≤ x ≤ 1) and YBa 2Cu 3O y (6.35 ≤ y ≤ 7) revealed a “negative Hall anomaly” below T c, in the mixed state. For both systems, the depth Δ of the negative Hall signal scales with T/T c, while the maximum value of Δ decreases monotonically with decreasing T c and vanishes at T c ≈ 68 K. These results show that the sign anomaly is not consistent with models that invoke pinning to explain this effect, and suggest that the negative anomaly could have an intrinsic origin. Hall effect measurements in the normal state of both systems show that the cotangent of the Hall angle can be described by cotθ H = AT 2 + B, where A increases linearly with decreasing T c for both systems, while B increases linearly with decreasing T c for Y 1−xPr xBa 2Cu 3O 7−δ and is constant within experimental error for YBa 2Cu 3O y.