Mixed-state hall effect and flux pinning in Ba(Fe1-xCo x)2As2 single crystals (x=0.08 and 0.10)

L. M. Wang, Un Cheong Sou, H. C. Yang, L. J. Chang, Cheng Maw Cheng, Ku Ding Tsuei, Y. Su, Th Wolf, P. Adelmann

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Abstract

Longitudinal and Hall resistivities, scaling behavior, and magnetizations are examined to study the effect of flux pinning in Ba(Fe1-xCo x)2As2 (BFCA) single crystals with x=0.08 and 0.01. Larger values of activation energy, critical current density, and pinning force are obtained in BFCA with x=0.10, indicating relatively strong pinning. The sign reversal of Hall resistivities is clearly observed in BFCA with x=0.10. The correlation between longitudinal and Hall resistivities shows the scaling behavior of ρxyxx)β with exponents β=3.0-3.4 and 2.0±0.2 for BFCA crystals with x=0.08 and 0.10, respectively. Furthermore, the normal-state Hall angle is also observed to follow cotθH=ΛT2+C in BFCA crystals, and is explained by the Anderson theory. The relatively large c/Λ value for BFCA with x=0.10 also implies a larger contribution of impurity scattering due to more Co atoms, which may cause stronger pinning of flux lines. The results are analyzed and coincide with theory, including the pinning-induced backflow effect and plastic flow mechanism in vortex dynamics.

Original languageEnglish
Article number134506
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume83
Issue number13
DOIs
Publication statusPublished - 2011 Apr 7

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Wang, L. M., Sou, U. C., Yang, H. C., Chang, L. J., Cheng, C. M., Tsuei, K. D., Su, Y., Wolf, T., & Adelmann, P. (2011). Mixed-state hall effect and flux pinning in Ba(Fe1-xCo x)2As2 single crystals (x=0.08 and 0.10). Physical Review B - Condensed Matter and Materials Physics, 83(13), [134506]. https://doi.org/10.1103/PhysRevB.83.134506