Giant out-of-plane magnetoresistance in Bi-Sr-Ca-Cu-O: A new dissipation mechanism in copper-oxide superconductors?
G. Briceo, M. F. Crommie, A. Zettl
DOI 10.1103/PhysRevLett.66.2164 · Physical Review Letters
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Abstract
We have measured the anisotropic magnetoresistivity tensor of single-crystal Bi2Sr2CaCu2O8 in the normal and in the mixed state. For magnetic fields applied perpendicular to the Cu-O (a-b) planes, the out-of-plane (c-axis) resistivity displays a huge magnetic enhancement, and a large apparent depression in the resistively measured transition temperature Tc (c axis). No such depression is observed in Tc(a-b plane). Although these results suggest a field-induced anisotropy in Tc, we propose an alternate model of novel Lorentz-force-independent fluctuation-induced dissipation in the mixed state. The model may also account for the anomalous anisotropic magnetoresistance observed in layered low-Tc superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 85 | Pressure not reported | onset |
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