P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe2( As0.67P 0.33)2

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

Research output: Contribution to journalArticle

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Abstract

P 31 and A 75 s NMR measurements were performed in superconducting BaFe2( As0.67P0.33)2 with Tc =30 K. The nuclear-spin-lattice relaxation rate T 1 -1 and the Knight shift in the normal state indicate the development of antiferromagnetic fluctuations, and T 1 -1 in the superconducting (SC) state decreases without a coherence peak just below Tc, as observed in (Ba1-x Kx) Fe2 As 2. In contrast to other iron arsenide superconductors, the T 1 -1 T behavior is observed below 4 K, indicating the presence of a residual density of states at zero energy. Our results suggest that strikingly different SC gaps appear in BaFe2 (As1-x Px)2despite a comparable Tc value, an analogous phase diagram, and similar Fermi surfaces to (Ba1-x Kx) Fe2 As2.

Original languageEnglish
Article number020503
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number2
DOIs
Publication statusPublished - Jan 6 2010
Externally publishedYes

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Spin-lattice relaxation
Fermi surface
Superconducting materials
Phase diagrams
Iron
Nuclear magnetic resonance
nuclear magnetic resonance
spin-lattice relaxation
nuclear spin
Fermi surfaces
phase diagrams
iron
energy

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe2( As0.67P 0.33)2 . / Nakai, Yusuke; Iye, Tetsuya; Kitagawa, Shunsaku; Ishida, Kenji; Kasahara, Shigeru; Shibauchi, Takasada; Matsuda, Yuji; Terashima, Takahito.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 81, No. 2, 020503, 06.01.2010.

Research output: Contribution to journalArticle

Nakai, Yusuke ; Iye, Tetsuya ; Kitagawa, Shunsaku ; Ishida, Kenji ; Kasahara, Shigeru ; Shibauchi, Takasada ; Matsuda, Yuji ; Terashima, Takahito. / P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe2( As0.67P 0.33)2 . In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 81, No. 2.
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AU - Nakai, Yusuke

AU - Iye, Tetsuya

AU - Kitagawa, Shunsaku

AU - Ishida, Kenji

AU - Kasahara, Shigeru

AU - Shibauchi, Takasada

AU - Matsuda, Yuji

AU - Terashima, Takahito

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AB - P 31 and A 75 s NMR measurements were performed in superconducting BaFe2( As0.67P0.33)2 with Tc =30 K. The nuclear-spin-lattice relaxation rate T 1 -1 and the Knight shift in the normal state indicate the development of antiferromagnetic fluctuations, and T 1 -1 in the superconducting (SC) state decreases without a coherence peak just below Tc, as observed in (Ba1-x Kx) Fe2 As 2. In contrast to other iron arsenide superconductors, the T 1 -1 T behavior is observed below 4 K, indicating the presence of a residual density of states at zero energy. Our results suggest that strikingly different SC gaps appear in BaFe2 (As1-x Px)2despite a comparable Tc value, an analogous phase diagram, and similar Fermi surfaces to (Ba1-x Kx) Fe2 As2.

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