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Evolution of superconductivity and antiferromagnetic order in Ba(Fe_(0.92-x)Co_(0.08)V_x)₂As₂

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arxiv 2001.10151 v1 pith:DSVNFM47 submitted 2020-01-28 cond-mat.supr-con

Evolution of superconductivity and antiferromagnetic order in Ba(Fe_(0.92-x)Co_(0.08)V_x)₂As₂

classification cond-mat.supr-con
keywords dopingantiferromagneticmagneticsuperconductivityevolutionorderaccordancebehavior
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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The vanadium doping effects on superconductivity and magnetism of iron pnictides are investigated in Ba(Fe$_{0.92-x}$Co$_{0.08}$V$_x$)$_2$As$_2$ by transport, susceptibility and neutron scattering measurements. The doping of magnetic impurity V causes a fast suppression of superconductivity with T$_c$ reduced at a rate of 7.4~K/1\%V. On the other hand, the long-range commensurate $C$-type antiferromagnetic order is recovered upon the V doping. The value of ordered magnetic moments of Ba(Fe$_{0.92-x}$Co$_{0.08}$V$_x$)$_2$As$_2$ follows a dome-like evolution versus doping concentration x. A possible Griffiths-type antiferromagnetic region of multiple coexisting phases in the phase diagram of Ba(Fe$_{0.92-x}$Co$_{0.08}$V$_x$)$_2$As$_2$ is identified, in accordance with previous theoretical predictions based on a cooperative behavior of the magnetic impurities and the conduction electrons mediating the Ruderman-Kittel-Kasuya-Yosida interactions between them.

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