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Title of Journal: J Supercond Nov Magn

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Abbravation: Journal of Superconductivity and Novel Magnetism

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Springer US

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DOI

10.1002/chin.199741357

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ISSN

1557-1947

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NMR Study Under Pressure on the La1111 Pnictides

Authors: N Fujiwara T Nakano H Okada H Takahashi Y Kamihara M Hirano H Hosono
Publish Date: 2010/12/30
Volume: 24, Issue: 3, Pages: 1145-1148
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Abstract

The relationship between antiferromagnetic AF fluctuation and superconductivity was investigated in the La1111 series LaFeAsO1−x F x x=005 008 and 014 by examining nuclear relaxation rates 1/T 1 at both ambient pressure and 30 GPa Although the AF fluctuation is enhanced by applying pressure in the underdoped regime x=005 and 008 the increase in critical transition temperature T c is small whereas T c increases remarkably in the overdoped regime x=014 where the AF fluctuation is absent suggesting that high T c above 40 K originates not from the AF fluctuation but from the density of states at the electron pocket

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