Flux-flow Hall effect in superconducting Tl sub 2 Ba sub 2 CaCu sub 2 O sub 8 films

• Published in: Physical review. B, Condensed matter Vol. 43:7
• Main Authors: Hagen, S.J., Lobb, C.J., Greene, R.L., Eddy, M.
• Format: Journal Article
• Language: English
• Published: United States 01-03-1991
• Subjects: 360204 - Ceramics, Cermets, & Refractories- Physical Properties; ALKALINE EARTH METAL COMPOUNDS; BARIUM COMPOUNDS; BARIUM OXIDES; CALCIUM COMPOUNDS; CALCIUM OXIDES; CHALCOGENIDES; COPPER COMPOUNDS; COPPER OXIDES; HALL EFFECT; HIGH-TC SUPERCONDUCTORS; MATERIALS SCIENCE; MIXED STATE; OXIDES; OXYGEN COMPOUNDS; SUPERCONDUCTING FILMS; SUPERCONDUCTORS; THALLIUM COMPOUNDS; THALLIUM OXIDES; TRANSITION ELEMENT COMPOUNDS
• ISSN: 0163-1829; 1095-3795
• DOI: 10.1103/PhysRevB.43.6246

In both high-{ital T}{sub {ital c}} and low-{ital T}{sub {ital c}} superconductors, the Hall effect in the mixed state often shows a sign reversal below {ital T}{sub {ital c}} that contradicts standard theories for flux-vortex motion. We have measured the mixed-state Hall effect in high-quality superconducting films of Tl{sub 2}Ba{sub 2}CaCu{sub 2}O{sub 8}, and find that the Hall angle {alpha} below {ital T}{sub {ital c}} consists of two components: A field-independent component exhibits a complicated temperature dependence, including a sign change near {ital T}{sub {ital c}}, while a second component with very weak temperature dependence is linear in field and resembles the normal-state Hall angle. The field independence of the sign-reversing component is evidence for vortex motion, and can be understood in terms of simple drag forces acting on vortices.