Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies

Guo Qing Zheng; K. Matano; S. Kawasaki; Z. Li; G. L. Sun; D. L. Sun; C. T. Lin; G. F. Chen; J. L. Luo; N. L. Wang; Z. A. Ren; Z. X. Zhao

doi:10.1007/s10948-010-0749-1

Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies

Guo Qing Zheng, K. Matano, S. Kawasaki, Z. Li, G. L. Sun, D. L. Sun, C. T. Lin, G. F. Chen, J. L. Luo, N. L. Wang, Z. A. Ren, Z. X. Zhao

School of Science

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

Abstract

We present extensive ⁷⁵As-NMR data on the electron-doped pnictides PrFeAsO _0.89F _0.11 (T _c = 45 K), LaFeAsO _0.92F _0.08 (T _c = 23 K), and the hole-doped Ba _0.72K _0.28Fe ₂As ₂ (T _c = 31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/T ₁ decreases below T _c with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T _c and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.

Original language	English
Pages (from-to)	609-612
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	23
Issue number	5
DOIs	https://doi.org/10.1007/s10948-010-0749-1
Publication status	Published - Jul 1 2010

Keywords

Iron-pnictide
NMR
Spin fluctuations
Superconducting gap

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1007/s10948-010-0749-1

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Zheng, G. Q., Matano, K., Kawasaki, S., Li, Z., Sun, G. L., Sun, D. L., Lin, C. T., Chen, G. F., Luo, J. L., Wang, N. L., Ren, Z. A., & Zhao, Z. X. (2010). Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies. Journal of Superconductivity and Novel Magnetism, 23(5), 609-612. https://doi.org/10.1007/s10948-010-0749-1

Zheng, GQ , Matano, K , Kawasaki, S, Li, Z, Sun, GL, Sun, DL, Lin, CT, Chen, GF, Luo, JL, Wang, NL, Ren, ZA & Zhao, ZX 2010, 'Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies', Journal of Superconductivity and Novel Magnetism, vol. 23, no. 5, pp. 609-612. https://doi.org/10.1007/s10948-010-0749-1

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title = "Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies",

abstract = "We present extensive 75As-NMR data on the electron-doped pnictides PrFeAsO 0.89F 0.11 (T c = 45 K), LaFeAsO 0.92F 0.08 (T c = 23 K), and the hole-doped Ba 0.72K 0.28Fe 2As 2 (T c = 31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/T 1 decreases below T c with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T c and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.",

keywords = "Iron-pnictide, NMR, Spin fluctuations, Superconducting gap",

author = "Zheng, {Guo Qing} and K. Matano and S. Kawasaki and Z. Li and Sun, {G. L.} and Sun, {D. L.} and Lin, {C. T.} and Chen, {G. F.} and Luo, {J. L.} and Wang, {N. L.} and Ren, {Z. A.} and Zhao, {Z. X.}",

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doi = "10.1007/s10948-010-0749-1",

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T2 - NMR studies

AU - Zheng, Guo Qing

AU - Matano, K.

AU - Kawasaki, S.

AU - Li, Z.

AU - Sun, G. L.

AU - Sun, D. L.

AU - Lin, C. T.

AU - Chen, G. F.

AU - Luo, J. L.

AU - Wang, N. L.

AU - Ren, Z. A.

AU - Zhao, Z. X.

PY - 2010/7/1

Y1 - 2010/7/1

N2 - We present extensive 75As-NMR data on the electron-doped pnictides PrFeAsO 0.89F 0.11 (T c = 45 K), LaFeAsO 0.92F 0.08 (T c = 23 K), and the hole-doped Ba 0.72K 0.28Fe 2As 2 (T c = 31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/T 1 decreases below T c with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T c and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.

AB - We present extensive 75As-NMR data on the electron-doped pnictides PrFeAsO 0.89F 0.11 (T c = 45 K), LaFeAsO 0.92F 0.08 (T c = 23 K), and the hole-doped Ba 0.72K 0.28Fe 2As 2 (T c = 31.5 K) single crystal. We find that the Fe antiferromagnetic spin fluctuations are anisotropic and are weaker compared to underdoped copper-oxides or cobalt-oxide superconductors. The spin lattice relaxation rate 1/T 1 decreases below T c with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below T c and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps.

KW - Iron-pnictide

KW - NMR

KW - Spin fluctuations

KW - Superconducting gap

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JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

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ER -

Multiple superconducting gaps and anisotropic spin fluctuations in hole-doped and electron-doped iron-pnictides: NMR studies

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