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, Hong-Chang 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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Flux pinning
flux pinning
Hall effect
Single crystals
Crystals
single crystals
Plastic flow
electrical resistivity
Magnetization
Vortex flow
Activation energy
Scattering
Impurities
Fluxes
scaling
Atoms
plastic flow
crystals
critical current
exponents

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mixed-state hall effect and flux pinning in Ba(Fe1-xCo x)2As2 single crystals (x=0.08 and 0.10). / Wang, L. M.; Sou, Un Cheong; Yang, Hong-Chang; Chang, L. J.; Cheng, Cheng Maw; Tsuei, Ku Ding; Su, Y.; Wolf, Th; Adelmann, P.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 83, No. 13, 134506, 07.04.2011.

Research output: Contribution to journalArticle

Wang, L. M. ; Sou, Un Cheong ; Yang, Hong-Chang ; Chang, L. J. ; Cheng, Cheng Maw ; Tsuei, Ku Ding ; Su, Y. ; Wolf, Th ; Adelmann, P. / Mixed-state hall effect and flux pinning in Ba(Fe1-xCo x)2As2 single crystals (x=0.08 and 0.10). In: Physical Review B - Condensed Matter and Materials Physics. 2011 ; Vol. 83, No. 13.
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