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We report bulk superconductivity induced by an isovalent doping of phosphorusin BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$. The P-for-As substitution results inshrinkage of lattice, especially for the FeAs block layers. The resistivityanomaly associated with the spin-density-wave (SDW) transition in the undopedcompound is gradually suppressed by the P doping. Superconductivity with themaximum $T_c$ of 30 K emerges at $x$=0.32, coinciding with a magnetic quantumcritical point (QCP) which is evidenced by the disappearance of SDW order andthe linear temperature-dependent resistivity in the normal state. The $T_c$values were found to decrease with further P doping, and no superconductivitywas observed down to 2 K for $x\geq$ 0.77. The appearance of superconductivityin the vicinity of QCP hints to the superconductivity mechanism in iron-basedarsenides.

Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe$_{2}$(As$_{1-x}$P$_{x}$)$_{2}$