Mixed-state Hall-effect studies in high-Tc-superconducting (YBa2Cu3O7−δ)n/(PrBa2Cu3O7−δ)m superlattices

Kebin Li; Yuheng Zhang; H. Adrian

doi:10.1103/PhysRevB.53.8608

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Mixed-state Hall-effect studies in high-Tc-superconducting (YBa2Cu3O7−δ)n/(PrBa2Cu3O7−δ)m superlattices

Kebin Li, Yuheng Zhang, H. Adrian

DOI 10.1103/PhysRevB.53.8608 · Physical Review B

T1

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Abstract

The mixed-state Hall conductivity behavior has been studied systematically on a series of superconducting (YBa2Cu3O7)n/(PrBa2Cu3O7)8 (here n=3,8,16,24,45,60) superlattices in three magnetic fields with H‖‖c axis and H⊥J. It was found that the Hall sign anomaly diminishes and even disappears with the decreasing of the YBCO layer thickness, i.e., the increase of the anisotropy parameter ε, and the decrease of the pinning strength. The scaling relationship between the Hall resistivity ρxy and the longitudinal resistivity ρxx, i.e., ρxy∝ρxxα holds for all of the samples with various ε. This indicates that the anomalous Hall sign reversal is independent of the scaling law between ρxy and ρxx. The present work supports the Wang, Dong, and Ting theory which suggested that the mixed-state Hall sign anomaly originated from the backflow current due to the pinning force and the thermal fluctuations. © 1996 The American Physical Society.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	70	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	75	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	88.5	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90.5	Pressure unresolved	zero_resistance
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure unresolved	zero_resistance
Tl2Ba2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown