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

Shunsaku Kitagawa, Takeshi Kawamura, Kenji Ishida, Yuta Mizukami, Shigeru Kasahara, Takasada Shibauchi, Takahito Terashima, Yuji Matsuda

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

To identify the key parameter for optimal superconductivity in iron pnictides, we measured the P31-NMR relaxation rate on BaFe2(As1-xPx)2(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 superconducting transition temperature Tc increases to twice its former value. In contrast, for x=0.28 near the AFM quantum critical point (QCP), the structural phase transition is quickly suppressed by pressure and Tc reaches a maximum. The analysis of the temperature-dependent nuclear relaxation rate indicates that these contrasting behaviors can be quantitatively explained by a single curve of the Tc dome as a function of Weiss temperature θ, which measures the distance to the QCP. Moreover, the Tc-θ curve under pressure precisely coincides with that with a chemical substitution, which is indicative of the existence of a universal relationship between low-energy AFM fluctuations and superconductivity on BaFe2(As1-xPx)2.

Original languageEnglish
Article number060503
JournalPhysical Review B
Volume100
Issue number6
DOIs
Publication statusPublished - Aug 12 2019
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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