Hall effect in the mixed state of superconducting L1.85Ce0.15CuO4 (L=Nd,Sm) single crystals
M. Cagigal, J. Fontcuberta, M. A. Crusellas, J. L. Vicent, S. Piñol
DOI 10.1103/PhysRevB.50.15993 · Physical Review B
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Abstract
The temperature and field dependencies of the Hall voltage in the mixed and in the normal state of supeconducting L1.85Ce0.15CuO4 (L=Nd and Sm) single crystals have been measured. Crystals having different critical temperatures (15<Tc<20 K) and transition widths (0.5<ΔTc<3 K) have been used in order to explore the effects of crystal quality on the controversial mixed-state Hall effect. In spite of the cerium doping, the normal-state Hall coefficient is found to be positive at low temperatures (T≳Tc) for all measured crystals. At higher temperatures (T≫Tc), the Hall coefficient becomes negative. In the mixed state, the Hall resistivity displays an anomalous ρxy(H) peak. However, in contrast to what has been found in other high-Tc superconductors, the polarity of the anomaly can have, depending on temperature, either the same sign or opposite to the Hall effect in the normal state, just above Tc. The appearance of the ρxy(H) anomaly is not ubiquitous but is only observed in crystals of narrow transition widths. To account for these results we explore several of the possible explanations that have been already proposed.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 15.9 | Pressure not reported | midpoint |
| Nd1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 20 | Pressure not reported | midpoint |
| Sm1.85Ce0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 13.5 | Pressure not reported | midpoint |
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