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Evolution of transport properties of BaFe2-xRuxAs2 in a wide range of isovalent Ru substitution

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arxiv 1109.1083 v1 pith:T5AS5YPH submitted 2011-09-06 cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el

Evolution of transport properties of BaFe2-xRuxAs2 in a wide range of isovalent Ru substitution

classification cond-mat.supr-con cond-mat.mtrl-scicond-mat.str-el
keywords dopingcoefficientdependencehallpropertiessubstitutiontransportbafe2-xruxas2
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The effects of isovalent Ru substitution at the Fe sites of BaFe2-xRuxAs2 are investigated by measuring resistivity and Hall coefficient on high-quality single crystals in a wide range of doping (0 < x < 1.4). Ru substitution weakens the antiferromagnetic (AFM) order, inducing superconductivity for relatively high doping level of 0.4 < x < 0.9. Near the AFM phase boundary, the transport properties show non-Fermi-liquid-like behaviors with a linear-temperature dependence of resistivity and a strong temperature dependence of Hall coefficient with a sign change. Upon higher doping, however, both of them recover conventional Fermi-liquid behaviors. Strong doping dependence of Hall coefficient together with a small magnetoresistance suggest that the anomalous transport properties can be explained in terms of anisotropic charge carrier scattering due to interband AFM fluctuations rather than a conventional multi-band scenario.

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