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 - Jan 1 2012
EventInternational Conference on Strongly Correlated Electron Systems, SCES 2011 - Cambridge, United Kingdom
Duration: Aug 29 2011Sep 3 2011

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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, 391(1), [012127]. https://doi.org/10.1088/1742-6596/391/1/012127