Journal
PHYSICAL REVIEW LETTERS
Volume 105, Issue 10, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.105.107003
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Funding
- MEXT [20102006]
- JSPS
- Grants-in-Aid for Scientific Research [21340099] Funding Source: KAKEN
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Spin dynamics evolution of BaFe2(As1-xPx)(2) was probed as a function of P concentration via P-31 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 theta 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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