On the origin of non-monotonic doping dependence of the in-plane resistivity anisotropy in Ba(Fe${}_{1-x}{T}_x$)${}_2$As${}_2$, $T$ = Co, Ni and Cu

Abstract

The in-plane resistivity anisotropy has been measured for detwinned single crystals of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ and Ba(Fe${}_{1-x}$Cu${}_x$)${}_2$As${}_2$. The data reveal a non-monotonic doping dependence, similar to previous observations for Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$. Magnetotransport measurements of the parent compound reveal a non-linear Hall coefficient and a strong linear term in the transverse magnetoresistance. Both effects are rapidly suppressed with chemical substitution over a similar compositional range as the onset of the large in-plane resistivity anisotropy. It is suggested that the relatively small in-plane anisotropy of the parent compound in the spin density wave state is due to the presence of an isotropic, high mobility pocket of reconstructed Fermi surface. Progressive suppression of the contribution to the conductivity arising from this isotropic pocket with chemical substitution eventually reveals the underlying in-plane anisotropy associated with the remaining FS pockets.

12 pages, 9 figures

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