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000015732 084__ $$2WoS$$aPhysics, Condensed Matter
000015732 1001_ $$0P:(DE-HGF)0$$aWang, L.M.$$b0
000015732 245__ $$aMixed-state Hall effect and flux pinning in Ba (Fe1-xCox) 2As2 single crystals (x = 0.08 and 0.10)
000015732 260__ $$aCollege Park, Md.$$bAPS$$c2011
000015732 300__ $$a134506
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000015732 440_0 $$04919$$aPhysical Review B$$v83$$x1098-0121$$y13
000015732 500__ $$aThe authors thank the National Science Council of Taiwan for financial support under Grants No. NSC 98-2112-M-212-001-MY3 (L. M. W.), No. NSC 96-2739-M-213-001, and No. NSC 96-2112-M-007-012 (L.J.C.). T. W. and P. A. acknowledge financial support through the Deutsche Forschungsgemeinschaft (SPP 1458).
000015732 520__ $$aLongitudinal and Hall resistivities, scaling behavior, and magnetizations are examined to study the effect of flux pinning in Ba(Fe1-xCox)(2)As-2 (BFCA) single crystals with x = 0.08 and 0.01. Larger values of activation energy, critical current density, and pinning force are obtained in BFCA with x = 0.10, indicating relatively strong pinning. The sign reversal of Hall resistivities is clearly observed in BFCA with x = 0.10. The correlation between longitudinal and Hall resistivities shows the scaling behavior of rho(xy) proportional to (rho(xx))(beta) with exponents beta = 3.0-3.4 and 2.0+/-0.2 for BFCA crystals with x = 0.08 and 0.10, respectively. Furthermore, the normal-state Hall angle is also observed to follow cot theta(H) = Lambda T-2 + C in BFCA crystals, and is explained by the Anderson theory. The relatively large C/Lambda value for BFCA with x = 0.10 also implies a larger contribution of impurity scattering due to more Co atoms, which may cause stronger pinning of flux lines. The results are analyzed and coincide with theory, including the pinning-induced backflow effect and plastic flow mechanism in vortex dynamics.
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000015732 7001_ $$0P:(DE-Juel1)VDB99383$$aYang, H.C.Ü$$b2$$uFZJ
000015732 7001_ $$0P:(DE-HGF)0$$aChang, L.J.$$b3
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