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Effects of Ru Substitution on Dimensionality and Electron Correlations in Ba(Fe_{1-x}Ru_x)_2As_2

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arxiv 1203.4699 v1 pith:K23KYSC6 submitted 2012-03-21 cond-mat.supr-con cond-mat.str-el

N. Xu , T. Qian , P. Richard , Y.-B. Shi , X.-P. Wang , P. Zhang , Y.-B. Huang , Y.-M. Xu
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H. Miao G. Xu G.-F. Xuan W.-H. Jiao Z.-A. Xu G.-H. Cao H. Ding
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classification cond-mat.supr-concond-mat.str-el
keywords substitutioneffectselectronangle-resolvedantiferromagnetismcloseconcentrationscorrelations
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abstract

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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