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

doi:10.1103/PhysRevB.81.020503

P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe₂( As_0.67P _0.33)₂

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

Research output: Contribution to journal › Article › peer-review

143 Citations (Scopus)

Abstract

P 31 and A 75 s NMR measurements were performed in superconducting BaFe₂( As_0.67P_0.33)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 (Ba_1-x K_x) 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 (As_1-x P_x)₂despite a comparable Tc value, an analogous phase diagram, and similar Fermi surfaces to (Ba_1-x K_x) Fe₂ As₂.

Original language	English
Article number	020503
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	81
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevB.81.020503
Publication status	Published - Jan 6 2010
Externally published	Yes

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "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",

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.",

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

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T1 - 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

AU - Nakai, Yusuke

AU - Iye, Tetsuya

AU - Kitagawa, Shunsaku

AU - Ishida, Kenji

AU - Kasahara, Shigeru

AU - Shibauchi, Takasada

AU - Matsuda, Yuji

AU - Terashima, Takahito

PY - 2010/1/6

Y1 - 2010/1/6

N2 - 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.

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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P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe₂( As_0.67P _0.33)₂

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