TY - JOUR
T1 - NMR study under pressure on the La1111 pnictides, LaFeAsO 1-x F x
AU - Fujiwara, N.
AU - Nakano, T.
AU - Okada, H.
AU - Takahashi, H.
AU - Kamihara, Y.
AU - Hirano, M.
AU - Hosono, H.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2011/4
Y1 - 2011/4
N2 - The relationship between antiferromagnetic (AF) fluctuation and superconductivity was investigated in the La1111 series, LaFeAsO 1-x F x (x=0.05, 0.08, and 0.14) by examining nuclear relaxation rates (1/T 1) at both ambient pressure and 3.0 GPa. Although the AF fluctuation is enhanced by applying pressure in the underdoped regime (x=0.05, and 0.08), the increase in critical transition temperature (T c) is small, whereas T c increases remarkably in the overdoped regime (x=0.14) 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.
AB - The relationship between antiferromagnetic (AF) fluctuation and superconductivity was investigated in the La1111 series, LaFeAsO 1-x F x (x=0.05, 0.08, and 0.14) by examining nuclear relaxation rates (1/T 1) at both ambient pressure and 3.0 GPa. Although the AF fluctuation is enhanced by applying pressure in the underdoped regime (x=0.05, and 0.08), the increase in critical transition temperature (T c) is small, whereas T c increases remarkably in the overdoped regime (x=0.14) 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.
KW - High pressure
KW - La 1111 series
KW - NMR
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U2 - 10.1007/s10948-010-1097-x
DO - 10.1007/s10948-010-1097-x
M3 - Article
AN - SCOPUS:79952538975
VL - 24
SP - 1145
EP - 1148
JO - Journal of Superconductivity and Novel Magnetism
JF - Journal of Superconductivity and Novel Magnetism
SN - 1557-1939
IS - 3
ER -