Structural and magnetic phase transitions near optimal superconductivity in BaFe$_2$(As$_{1-x}$P$_x$)$_2$

We use nuclear magnetic resonance (NMR), high-resolution x-ray and neutron scattering to study structural and magnetic phase transitions in phosphorus-doped BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ . Previous transport, NMR, specific heat, and magnetic penetration depth measurements have provided compelling evidence for the presence of a quantum critical point (QCP) near optimal superconductivity at $x = 0.3$ . However, we show that the tetragonal-to-orthorhombic structural ( $T_{s}$ ) and paramagnetic to antiferromagnetic (AF, $T_{N}$ ) transitions in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ are always coupled and approach to $T_{N} \approx T_{s} \geq T_{c}$ ( $\approx 29$ K) for $x = 0.29$ before vanishing abruptly for $x \geq 0.3$ . These results suggest that AF order in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$ disappears in a weakly first order fashion near optimal superconductivity, much like the electron-doped iron pnictides with an avoided QCP.

Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

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Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

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Structural and magnetic phase transitions near optimal superconductivity in BaFe22​(As1−x1−x​Pxx​)22​

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Structural and magnetic phase transitions near optimal superconductivity in BaFe22​(As1−x1−x​Pxx​)22​

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Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

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Structural and magnetic phase transitions near optimal superconductivity in BaFe $_{2}$ (As $_{1 - x}$ P $_{x}$ ) $_{2}$

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