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Mixed-state Hall effect and flux pinning in Ba(Fe$$_{1-x}$$Co$$_{x}$$)$$_{2}$$As$$_{2}$$ single crystals (x = 0.08 and 0.10)

Wang, L. M.*; Sou, U.-C.*; Yang, H. C.*; Chang, L.-J.; Cheng, C.-M.*; Tsuei, K.-D.*; Su, Y.*; Wolf, T.*; Adelmann, P.*

Longitudinal and Hall resistivities, scaling behavior, and magnetizations are examined to study the effect of flux pinning in Ba(Fe$$_{1-x}$$Co$$_{x}$$)$$_{2}$$As$$_{2}$$ (BFCA) single crystals with x = 0.08 and 0.10. Larger values of activation energy, critical current density, and pinning force are obtained in BFCA with x=0.10, indicating relatively strong pinning. The correlation between longitudinal and Hall resistivities shows the scaling behavior of $$rho_{xy} propto {(rho_{xx})}^{beta}$$ with exponents $$beta$$ = 3.0-3.4 and 2.0$$pm$$0.2 for BFCA crystals with x = 0.08 and 0.10, respectively. Furthermore, the normal-state Hall angle is also observed, and is explained by the Anderson theory. The results are analyzed and coincide with the theory, including the pinning-induced backflow effect and plastic flow mechanism in vortex dynamics.

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Category:Materials Science, Multidisciplinary

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