P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2

31P-NMR measurements were performed in the iron pnictides BaFe2(As1−xPx)2 for 0.07 ≤ x ≤ 0.64 in order to investigate evolution of electronic state with isovalent substitution. In general, the spin part of the Knight shift Kspin and (T1T)−1/2 are proportional to the quasiparticle density of states a...

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Bibliographic Details
Published in:Journal of physics. Conference series 2012-12, Vol.391 (1)
Main Authors: Iye, Tetsuya, Nakai, Yusuke, Kitagawa, Shunsaku, Ishida, Kenji, Ikeda, Hiroaki, Kasahara, Shigeru, Shibauchi, Takasada, Matsuda, Yuji, Terashima, Takahito
Format: Article
Language:English
Subjects:
Antiferromagnetism
Density of states
Electron states
Elementary excitations
Group 5A compounds
High temperature
NMR
Nuclear magnetic resonance
Physics
Substitutes
Superconductivity
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Summary:31P-NMR measurements were performed in the iron pnictides BaFe2(As1−xPx)2 for 0.07 ≤ x ≤ 0.64 in order to investigate evolution of electronic state with isovalent substitution. In general, the spin part of the Knight shift Kspin and (T1T)−1/2 are proportional to the quasiparticle density of states at the Fermi level N(EF) at high temperature where the Korringa relation holds. We found that Kspin and (T1T)−1/2 are almost unaffected by the P-substitution, indicating that N(EF) is nearly constant. These results are quantitatively consistent with our band calculation. We claim that the slight changes of N(EF) by P-substitution in BaFe2(As1−xPx)2 is not enough to explain the Tc variation ranging from 30 K to 0 K, and thus suggest that antiferromagnetic correlations related to the quantum critical character are essential for the high Tc superconductivity.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/391/1/012127