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

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arxiv 1005.2853 v2 pith:YHM2QCMY submitted 2010-05-17 cond-mat.supr-con cond-mat.str-el

Y. Nakai , T. Iye , S. Kitagawa , K. Ishida , H. Ikeda , S. Kasahara , H. Shishido , T. Shibauchi
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Y. Matsuda T. Terashima
This is my paper · ORCID
classification cond-mat.supr-concond-mat.str-el
keywords antiferromagneticfluctuationssuperconductivityapproachingas1-xpxassociatedbafebafe2
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abstract

Spin dynamics evolution of BaFe$_2$(As$_{1-x}$P$_x$)$_2$ was probed as a function of P concentration via $^{31}$P 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, magnetically ordered temperature $\theta$ deduced from the relaxation rate vanishes at optimal doping. These results provide clear-cut evidence for a quantum-critical point (QCP), suggesting that the AF fluctuations associated with the QCP play a central role in the high-$T_c$ superconductivity.

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