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- W2045481639 abstract "We report systematic 57Fe-NMR study on an underdoped sample (Tc = 20 K), an optimally doped sample (Tc = 28 K), and an overdoped sample (Tc = 22 K) of oxygen-deficient iron (Fe)-based oxypnictide superconductor LaFeAsO1−y. The 57Fe-1/T1T in the normal state decreases significantly upon cooling regardless of an electron-doping level, revealing that 1/T1T is not always enhanced by antiferromagnetic fluctuations close to an antiferromagnetic phase in the underdoped superconducting sample. This contrasts with the behavior in hole-doped Ba0.6K0.4Fe2As2(Tc = 38 K), which exhibits a significant increase in 1/T1T upon cooling. We suggest that the crucial difference between the normal-state properties of LaFeAsO1−yand Ba0.6K0.4Fe2As2 originates from the fact that the relevant Fermi surface topologies are differently modified depending on whether electrons or holes are doped into the FeAs layers." @default.
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- W2045481639 date "2010-01-01" @default.
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- W2045481639 title "57Fe-NMR study on iron-oxypnictide superconductor LaFeAsO1−y" @default.
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- W2045481639 doi "https://doi.org/10.1088/1742-6596/200/1/012132" @default.
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