Hall effect above Tc in untwinned single-crystal YBa2Cu3O7−x: Normal-state behavior and superconducting fluctuations
J. P. Rice, J. Giapintzakis, D. M. Ginsberg, J. M. Mochel
DOI 10.1103/PhysRevB.44.10158 · Physical Review B
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Abstract
We present a measurement of the Hall coefficient RH for an untwinned single crystal of YBa2Cu3O7−x. The crystal was produced by a method that does not involve thermomechanical detwinning, and has a resistivity along the copper-oxide chains of only 29 μΩ cm at 100 K, indicating high sample quality. The in-plane resistivity and 1/RH become linear in temperature as T rises significantly above Tc. Near Tc we observe deviation from this linearity, and we interpret it as indicating thermodynamic fluctuations in a layered superconductor. Fits of this model to both the resistivity and Hall-effect data yield physically reasonable values for the fitting parameters. Evidence is obtained that the two copper-oxide planes in each unit cell are tightly coupled, acting as one superconducting layer. Surprisingly, the best fits indicate that the Hall-effect fluctuations are dominated by the Maki-Thompson process rather than the Aslamazov-Larkin process.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.9 | Pressure not reported | onset |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94.5 | Pressure not reported | midpoint |
| YBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | zero_resistance |
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