Journal
PHYSICAL REVIEW LETTERS
Volume 110, Issue 20, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.207001
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Funding
- Japan Society for the Promotion of Science (JSPS)
- Transformative Research-Project on Iron Pnictides (TRIP) from the Japan Science and Technology Agency
- Japan-China-Korea A3 Foresight Program from JSPS
- Ministry of Education, Culture, Sports, Science, and Technology in Japan
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We investigated the in-plane resistivity anisotropy for underdoped Ba(Fe1-xCox)(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.
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