Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog

Z. Li; S. Kawasaki; T. Oka; T. Tabuchi; Y. Ooe; M. Ichioka; Z. A. Ren; Z. X. Zhao; J. L. Luo; N. L. Wang; X. C. Wang; Q. Q. Liu; C. Q. Jin; C. T. Lin; Guo Qing Zheng

doi:10.1016/j.jpcs.2010.10.038

Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog

Z. Li, S. Kawasaki, T. Oka, T. Tabuchi, Y. Ooe, M. Ichioka, Z. A. Ren, Z. X. Zhao, J. L. Luo, N. L. Wang, X. C. Wang, Q. Q. Liu, C. Q. Jin, C. T. Lin, Guo Qing Zheng

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

2 Citations (Scopus)

Abstract

We present extensive ⁷⁵As NMR and NQR data on the superconducting arsenides PrFeAs_0.89F_0.11 (T _c=45K), LaFeAsO_0.92F_0.08 (T_c=27K), LiFeAs (T_c=17K) and Ba_0.72K_0.28Fe ₂As₂ (T_c=31.5K) single crystal, and compare with the nickel analog LaNiAsO_0.9F_0.1 (T _c=4.0K). In contrast to LaNiAsO_0.9F_0.1 where the superconducting gap is shown to be isotropic, the spin lattice relaxation rate 1/T₁ in the Fe-arsenides 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 in the Fe-arsenides. The Fe antiferromagnetic spin fluctuations are anisotropic and weaker compared to underdoped copper-oxides or cobalt-oxide superconductors, while there is no significant electron correlations in LaNiAsO _0.9F_0.1. We will discuss the implications of these results and highlight the importance of the Fermi surface topology.

Original language	English
Pages (from-to)	492-496
Number of pages	5
Journal	Journal of Physics and Chemistry of Solids
Volume	72
Issue number	5
DOIs	https://doi.org/10.1016/j.jpcs.2010.10.038
Publication status	Published - May 2011

Keywords

D. NMR
D. Superconductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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10.1016/j.jpcs.2010.10.038

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Li, Z., Kawasaki, S., Oka, T., Tabuchi, T., Ooe, Y., Ichioka, M., Ren, Z. A., Zhao, Z. X., Luo, J. L., Wang, N. L., Wang, X. C., Liu, Q. Q., Jin, C. Q., Lin, C. T., & Zheng, G. Q. (2011). Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog. Journal of Physics and Chemistry of Solids, 72(5), 492-496. https://doi.org/10.1016/j.jpcs.2010.10.038

Li, Z, Kawasaki, S, Oka, T, Tabuchi, T, Ooe, Y, Ichioka, M, Ren, ZA, Zhao, ZX, Luo, JL, Wang, NL, Wang, XC, Liu, QQ, Jin, CQ, Lin, CT & Zheng, GQ 2011, 'Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog', Journal of Physics and Chemistry of Solids, vol. 72, no. 5, pp. 492-496. https://doi.org/10.1016/j.jpcs.2010.10.038

@article{a7bc9eada7d94fde9279432e0cfb7ee8,

title = "Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog",

abstract = "We present extensive 75As NMR and NQR data on the superconducting arsenides PrFeAs0.89F0.11 (T c=45K), LaFeAsO0.92F0.08 (Tc=27K), LiFeAs (Tc=17K) and Ba0.72K0.28Fe 2As2 (Tc=31.5K) single crystal, and compare with the nickel analog LaNiAsO0.9F0.1 (T c=4.0K). In contrast to LaNiAsO0.9F0.1 where the superconducting gap is shown to be isotropic, the spin lattice relaxation rate 1/T1 in the Fe-arsenides decreases below Tc with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below Tc and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps in the Fe-arsenides. The Fe antiferromagnetic spin fluctuations are anisotropic and weaker compared to underdoped copper-oxides or cobalt-oxide superconductors, while there is no significant electron correlations in LaNiAsO 0.9F0.1. We will discuss the implications of these results and highlight the importance of the Fermi surface topology.",

keywords = "D. NMR, D. Superconductivity",

author = "Z. Li and S. Kawasaki and T. Oka and T. Tabuchi and Y. Ooe and M. Ichioka and Ren, {Z. A.} and Zhao, {Z. X.} and Luo, {J. L.} and Wang, {N. L.} and Wang, {X. C.} and Liu, {Q. Q.} and Jin, {C. Q.} and Lin, {C. T.} and Zheng, {Guo Qing}",

note = "Funding Information: We gratefully acknowledge the support from CAS, National Science Foundation of China, JSPS and MEXT of Japan. ",

year = "2011",

month = may,

doi = "10.1016/j.jpcs.2010.10.038",

language = "English",

volume = "72",

pages = "492--496",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides

T2 - Comparison with nickel analog

AU - Li, Z.

AU - Kawasaki, S.

AU - Oka, T.

AU - Tabuchi, T.

AU - Ooe, Y.

AU - Ichioka, M.

AU - Ren, Z. A.

AU - Zhao, Z. X.

AU - Luo, J. L.

AU - Wang, N. L.

AU - Wang, X. C.

AU - Liu, Q. Q.

AU - Jin, C. Q.

AU - Lin, C. T.

AU - Zheng, Guo Qing

N1 - Funding Information: We gratefully acknowledge the support from CAS, National Science Foundation of China, JSPS and MEXT of Japan.

PY - 2011/5

Y1 - 2011/5

N2 - We present extensive 75As NMR and NQR data on the superconducting arsenides PrFeAs0.89F0.11 (T c=45K), LaFeAsO0.92F0.08 (Tc=27K), LiFeAs (Tc=17K) and Ba0.72K0.28Fe 2As2 (Tc=31.5K) single crystal, and compare with the nickel analog LaNiAsO0.9F0.1 (T c=4.0K). In contrast to LaNiAsO0.9F0.1 where the superconducting gap is shown to be isotropic, the spin lattice relaxation rate 1/T1 in the Fe-arsenides decreases below Tc with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below Tc and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps in the Fe-arsenides. The Fe antiferromagnetic spin fluctuations are anisotropic and weaker compared to underdoped copper-oxides or cobalt-oxide superconductors, while there is no significant electron correlations in LaNiAsO 0.9F0.1. We will discuss the implications of these results and highlight the importance of the Fermi surface topology.

AB - We present extensive 75As NMR and NQR data on the superconducting arsenides PrFeAs0.89F0.11 (T c=45K), LaFeAsO0.92F0.08 (Tc=27K), LiFeAs (Tc=17K) and Ba0.72K0.28Fe 2As2 (Tc=31.5K) single crystal, and compare with the nickel analog LaNiAsO0.9F0.1 (T c=4.0K). In contrast to LaNiAsO0.9F0.1 where the superconducting gap is shown to be isotropic, the spin lattice relaxation rate 1/T1 in the Fe-arsenides decreases below Tc with no coherence peak and shows a step-wise variation at low temperatures. The Knight shift decreases below Tc and shows a step-wise T variation as well. These results indicate spin-singlet superconductivity with multiple gaps in the Fe-arsenides. The Fe antiferromagnetic spin fluctuations are anisotropic and weaker compared to underdoped copper-oxides or cobalt-oxide superconductors, while there is no significant electron correlations in LaNiAsO 0.9F0.1. We will discuss the implications of these results and highlight the importance of the Fermi surface topology.

KW - D. NMR

KW - D. Superconductivity

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DO - 10.1016/j.jpcs.2010.10.038

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AN - SCOPUS:79955753958

SN - 0022-3697

VL - 72

SP - 492

EP - 496

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 5

ER -

Multiple superconducting gap and anisotropic spin fluctuations in iron arsenides: Comparison with nickel analog

Abstract

Keywords

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