Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xP x)2

Y. Nakai, T. Iye, S. Kitagawa, K. Ishida, H. Ikeda, S. Kasahara, H. Shishido, T. Shibauchi, Y. Matsuda, T. Terashima

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Abstract

Spin dynamics evolution of BaFe2(As1-xP x)2 was probed as a function of P concentration via P31 NMR. Our NMR study reveals that two-dimensional antiferromagnetic (AF) fluctuations are notably enhanced with little change in static susceptibility on approaching the AF phase from the superconducting dome. Moreover, the magnetically ordered temperature θ deduced from the relaxation rate vanishes at optimal doping. These results provide clear-cut evidence for a quantum-critical point, suggesting that the AF fluctuations associated with the quantum-critical point play a central role in the high-Tc superconductivity.

Original languageEnglish
Article number107003
JournalPhysical Review Letters
Volume105
Issue number10
DOIs
Publication statusPublished - Sep 2 2010

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Nakai, Y., Iye, T., Kitagawa, S., Ishida, K., Ikeda, H., Kasahara, S., Shishido, H., Shibauchi, T., Matsuda, Y., & Terashima, T. (2010). Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xP x)2. Physical Review Letters, 105(10), [107003]. https://doi.org/10.1103/PhysRevLett.105.107003