TY  - JOUR
AU  - Wang, L.M.
AU  - Sou, U.C.
AU  - Yang, H.C.Ü
AU  - Chang, L.J.
AU  - Cheng, C.M.
AU  - Tsuei, K.D.
AU  - Su, Y.
AU  - Wolf, Th.
AU  - Adelmann, P.
TI  - Mixed-state Hall effect and flux pinning in Ba (Fe1-xCox) 2As2 single crystals (x = 0.08 and 0.10)
JO  - Physical review / B
VL  - 83
IS  - 13
SN  - 1098-0121
CY  - College Park, Md.
PB  - APS
M1  - PreJuSER-15732
SP  - 134506
PY  - 2011
N1  - 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).
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000289228800008
DO  - DOI:10.1103/PhysRevB.83.134506
UR  - https://juser.fz-juelich.de/record/15732
ER  -