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

Tetsuya Iye, Yusuke Nakai, Shunsaku Kitagawa, Kenji Ishida, Hiroaki Ikeda, Shigeru Kasahara, Takasada Shibauchi, Yuji Matsuda, Takahito Terashima

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Abstract

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.

Original languageEnglish
Article number012127
JournalJournal of Physics: Conference Series
Volume391
Issue number1
DOIs
Publication statusPublished - 2012
Externally publishedYes

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substitutes
nuclear magnetic resonance
Group 5A compounds
superconductivity
iron
electronics

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Iye, T., Nakai, Y., Kitagawa, S., Ishida, K., Ikeda, H., Kasahara, S., ... Terashima, T. (2012). P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2. Journal of Physics: Conference Series, 391(1), [012127]. https://doi.org/10.1088/1742-6596/391/1/012127

P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2. / Iye, Tetsuya; Nakai, Yusuke; Kitagawa, Shunsaku; Ishida, Kenji; Ikeda, Hiroaki; Kasahara, Shigeru; Shibauchi, Takasada; Matsuda, Yuji; Terashima, Takahito.

In: Journal of Physics: Conference Series, Vol. 391, No. 1, 012127, 2012.

Research output: Contribution to journalArticle

Iye, T, Nakai, Y, Kitagawa, S, Ishida, K, Ikeda, H, Kasahara, S, Shibauchi, T, Matsuda, Y & Terashima, T 2012, 'P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2', Journal of Physics: Conference Series, vol. 391, no. 1, 012127. https://doi.org/10.1088/1742-6596/391/1/012127
Iye, Tetsuya ; Nakai, Yusuke ; Kitagawa, Shunsaku ; Ishida, Kenji ; Ikeda, Hiroaki ; Kasahara, Shigeru ; Shibauchi, Takasada ; Matsuda, Yuji ; Terashima, Takahito. / P-concentration dependence of the quasiparticle density of states in BaFe2(As1-xPx)2. In: Journal of Physics: Conference Series. 2012 ; Vol. 391, No. 1.
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AU - Ishida, Kenji

AU - Ikeda, Hiroaki

AU - Kasahara, Shigeru

AU - Shibauchi, Takasada

AU - Matsuda, Yuji

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AB - 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.

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