Abstract
We report on measurements of the mixed-state Hall effect in Bi/sub 2/Sr/sub 2/CaCu/sub 2/O/sub x/ thin films in magnetic fields ranging from B=60 mT to B=1 T and current densities j up to 3 MA cm/sup -2/. To reduce the problem of sample heating, we employed a pulsed current technique and developed a new heating correction procedure. We observe a double sign reversal of the Hall resistivity rho /sub yx/ in the mixed state, resulting in two peaks which both depend on B and j. The position of the sign changes only varies with B, but is found to be independent of j. The Hall conductivity sigma /sub xy/ turns positive again in the superconducting regime and dramatically increases towards lower temperatures and current densities, as the pinning is reduced by intense currents.
| Original language | English |
|---|---|
| Pages (from-to) | 627-629 |
| Number of pages | 3 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 317-318 |
| DOIs | |
| Publication status | Published - 1999 |
Austrian Fields of Science 2012
- 103018 Materials physics
Keywords
- bismuth-compounds; calcium-compounds; current-density; flux-pinning; Hall-effect; high-temperature-superconductors; mixed-state; strontium-compounds; superconducting-thin-films; superconducting-transition-temperature Bi-sub-2-Sr-sub-2-CaCu-sub-2-O-sub-x-; mixed-state-Hall-effect; current-density-dependence; superconducting-regime; magnetic-field-dependence; HTSC-thin-films; high-temperature-superconductor-thin-films; sign-reversal; temperature-dependence; Hall-conductivity; flux-pinning; 60-mT; 1-T; Bi-sub-2-Sr-sub-2-CaCu-sub-2-O-sub-8- A7430F-Transport-properties-of-superconductors; A7410-Superconducting-critical-temperature,-occurrence; A7460E-Mixed-state,-H/sub-c/sub-2,-surface-sheath; A7470V-Perovskite-phase-superconductors; A7475-Superconducting-films; A7460G-Flux-pinning,-flux-motion,-fluxon-defect-interactions