%0 Journal Article
%A Wang, L.M.
%A Sou, U.C.
%A Yang, H.C.Ü
%A Chang, L.J.
%A Cheng, C.M.
%A Tsuei, K.D.
%A Su, Y.
%A Wolf, Th.
%A Adelmann, P.
%T Mixed-state Hall effect and flux pinning in Ba (Fe1-xCox) 2As2 single crystals (x = 0.08 and 0.10)
%J Physical review / B
%V 83
%N 13
%@ 1098-0121
%C College Park, Md.
%I APS
%M PreJuSER-15732
%P 134506
%D 2011
%Z The 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).
%X Longitudinal 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000289228800008
%R 10.1103/PhysRevB.83.134506
%U https://juser.fz-juelich.de/record/15732