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Title: ^{31}P and ^{75}As NMR evidence for a residual density of states at zero energy in superconducting BaFe_{2}(As_{0.67}P_{0.33})_{2}
Authors: Nakai, Yusuke
Iye, Tetsuya
Kitagawa, Shunsaku
Ishida, Kenji  kyouindb  KAKEN_id
Kasahara, Shigeru  kyouindb  KAKEN_id
Shibauchi, Takasada
Matsuda, Yuji
Terashima, Takahito  kyouindb  KAKEN_id
Author's alias: 中井, 祐介
Issue Date: Jan-2010
Publisher: The American Physical Society
Journal title: Physical Review B
Volume: 81
Issue: 2
Thesis number: 020503
Abstract: 31P and 75As 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−xKx)Fe2As2. 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−xPx)2 despite a comparable Tc value, an analogous phase diagram, and similar Fermi surfaces to (Ba1−xKx)Fe2As2.
Rights: © 2010 The American Physical Society
DOI(Published Version): 10.1103/PhysRevB.81.020503
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