What Controls the Phase Diagram and Superconductivity in Ru-Substituted BaFe2As2?
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Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.
For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.
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Abstract
We use high resolution angle-resolved photoemission to study the electronic structure of the iron based high-temperature superconductors Ba(Fe1-xRux)(2)As-2 as a function of Ru concentration. We find that substitution of Ru for Fe is isoelectronic, i.e., it does not change the value of the chemical potential. More interestingly, there are no measured, significant changes in the shape of the Fermi surface or in the Fermi velocity over a wide range of substitution levels (0 < x < 0.55). Given that the suppression of the antiferromagnetic and structural phase is associated with the emergence of the superconducting state, Ru substitution must achieve this via a mechanism that does not involve changes of the Fermi surface. We speculate that this mechanism relies on magnetic dilution which leads to the reduction of the effective Stoner enhancement.
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This article is published as Dhaka, R. S., Chang Liu, Rafael M. Fernandes, Rui Jiang, C. P. Strehlow, Takeshi Kondo, A. Thaler et al. "What Controls the Phase Diagram and Superconductivity in Ru-Substituted BaFe 2 As 2?." Physical Review Letters 107, no. 26 (2011): 267002. DOI: 10.1103/PhysRevLett.107.267002. Posted with permission.