Physics – Condensed Matter – Superconductivity
Scientific paper
1999-05-14
Physics
Condensed Matter
Superconductivity
3 pages, 5 figures, submitted to Phys. Rev. Lett
Scientific paper
The mixed-state Hall resistivity and the longitudinal resistivity in HgBa_{2}CaCu_{2}O_{6}, HgBa_{2}Ca_{2}Cu_{3}O_{8}, and Tl_{2}Ba_{2}CaCu_{2}O_{8} thin films have been investigated as functions of the magnetic field up to 18 T. We observe the universal scaling behavior between \rho_{xy} and \rho_{xx} in the regions of the clean and the moderately clean limit. The scaling exponent \beta is 1.9 in the clean limit at high field and low temperature whereas \beta is 1.0 in the moderately clean limit at low field and high temperature, consistent with a theory based on the midgap states in the vortex cores. This finding implies that the Hall conductivity is also universal in Hg- and Tl-based superconductors.
Choi Chang Ho
Chu Cheng-Wei
Kang* Won Nam
Kim Hae-Dong
Kim Wan-Seon
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