Universal relationship between low-energy antiferromagnetic fluctuations and superconductivity in BaFe2(As1−xPx)2

  title={Universal relationship between low-energy antiferromagnetic fluctuations and superconductivity in 
  author={Shunsaku Kitagawa and Takeshi Kawamura and Kenji Ishida and Yuta Mizukami and Shigeru Kasahara and Takasada Shibauchi and Takahito Terashima and Yuji Matsuda},
  journal={Physical Review B},
To identify the key parameter for optimal superconductivity in iron pnictides, we measured the $^{31}\mathrm{P}$-NMR relaxation rate on ${\mathrm{BaFe}}_{2}{({\mathrm{As}}_{1\ensuremath{-}x}{\mathrm{P}}_{x})}_{2}\phantom{\rule{4pt}{0ex}}(x=0.22$ and 0.28) under pressure and compared the effects of chemical substitution and physical pressure. For $x=0.22$, structural and antiferromagnetic (AFM) transition temperatures both show minimal changes with pressure up to 2.4 GPa, whereas the… 
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