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  • Unconventional superconductivity and antiferromagnetic quantum critical behavior in the isovalent-doped BaFe2(As1-xPx)2
    Nakai, Y; Iye, T; Kitagawa, S; Ishida, K; Ikeda, H; Kasahara, S; Shishido, H; Shibauchi, T; Matsuda, Y; Terashima, T

    Physical review letters, 2010-Sep-03, Letnik: 105, Številka: 10
    Journal Article

    Spin dynamics evolution of BaFe2(As(1-x)Px){2} was probed as a function of P concentration via 31P 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-T(c) superconductivity.

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