N. Xu, T. Qian, P. Richard, Y. -B. Shi, X. -P. Wang, P. Zhang, Y. -B. Huang, Y. -M. Xu, H. Miao, G. Xu, G. -F. Xuan, W. -H. Jiao, Z. -A. Xu, G. -H. Cao, H. Ding
We report a systematic angle-resolved photoemission spectroscopy study on Ba(Fe$_{1-x}$Ru$_x$)$_2$As$_2$ for a wide range of Ru concentrations (0.15 $\leq$ \emph{x} $\leq$ 0.74). We observed a crossover from two-dimension to three-dimension for some of the hole-like Fermi surfaces with Ru substitution and a large reduction in the mass renormalization close to optimal doping. These results suggest that isovalent Ru substitution has remarkable effects on the low-energy electron excitations, which are important for the evolution of superconductivity and antiferromagnetism in this system.
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http://arxiv.org/abs/1203.4699
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