title: Anisotropy of the in-plane resistivity of underdoped Ba(Fe(1-x)Co(x))2As2 superconductors induced by impurity scattering in the antiferromagnetic orthorhombic phase.
abstract: We investigated the in-plane resistivity anisotropy for underdoped Ba(Fe(1-x)Co(x))(2)As(2) single crystals with improved quality. We demonstrate that the anisotropy in resistivity in the magnetostructural ordered phase arises from the anisotropy in the residual component which increases in proportion to the Co concentration x. This gives evidence that the anisotropy originates from the impurity scattering by Co atoms substituted for the Fe sites, rather than the so far proposed mechanisms such as the anisotropy of Fermi velocities of reconstructed Fermi surface pockets. As doping proceeds to the paramagnetic-tetragonal phase, a Co impurity transforms to a weak and isotropic scattering center.
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan and National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Ishida
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan and National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Nakajima
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan and National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Liang
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kihou
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: C H
authors.initials: CH
authors.lastname: Lee
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: A
authors.initials: A
authors.lastname: Iyo
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Eisaki
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kakeshita
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Tomioka
authors.affiliation: National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Ito
authors.affiliation: Department of Physics, University of Tokyo, Tokyo 113-0033, Japan and JST, Transformative Research-Project on Iron Pnictides, Tokyo 102-0075, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Uchida