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

We report bulk superconductivity induced by an isovalent doping of phosphorus in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ . The P-for-As substitution results in shrinkage of lattice, especially for the FeAs block layers. The resistivity anomaly associated with the spin-density-wave (SDW) transition in the undoped compound is gradually suppressed by the P doping. Superconductivity with the maximum $T_{c}$ of 30 K emerges at $x$ =0.32, coinciding with a magnetic quantum critical point (QCP) which is evidenced by the disappearance of SDW order and the linear temperature-dependent resistivity in the normal state. The $T_{c}$ values were found to decrease with further P doping, and no superconductivity was observed down to 2 K for $x \geq$ 0.77. The appearance of superconductivity in the vicinity of QCP hints to the superconductivity mechanism in iron-based arsenides.

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

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

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Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe22​(As1−x1−x​Pxx​)22​

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Superconductivity up to 30 K in the vicinity of quantum critical point in BaFe22​(As1−x1−x​Pxx​)22​

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

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

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