Unusual Hall effect in superconducting MgB2 films
R. Jin, M. Paranthaman, H. Y. Zhai, H. M. Christen, D. K. Christen, D. Mandrus
DOI 10.1103/PhysRevB.64.220506 · Physical Review B
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Abstract
We have investigated the temperature and magnetic field dependence of the Hall coefficient of two well-characterized superconducting MgB2 films (Tc0=38.0K) in both the normal and superconducting states. Our results show that the normal-state Hall coefficient RH is positive and increases with decreasing temperature, independent of the applied magnetic field (to 8 T). We find that RH−1∝T(40–300K) and cotθH∝T2(100–300K). As the sample is cooled below Tc(H), RH decreases rapidly with temperature and changes sign before it reaches zero. The position and magnitude at which RH shows a minimum depends on the applied field.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | zero_resistance |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.6 | Pressure not reported | onset |
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