As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni)

T. Oka, T. Tabuchi, Z. Li, Shinji Kawasaki, G. F. Chen, J. L. Luo, N. L. Wang, Guo-Qing Zheng

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report 75As nuclear quadrupole resonance (NQR) studies on oxypnictide superconductors LaFeAsO1-xFx (x=0.08, 0.15) and LaNiAsO1-xFx (x=0, 0.06, 0.10, 0.12). In LaFeAsO 0.92F0.08 (Tc=23 K), nuclear spin-lattice relaxation rate 1/T1 shows no coherence peak just below Tc and decreases with decreasing temperature accompanied by a hump structure at T∼0.4Tc, which is a characteristic of the multigap superconductivity. In the normal state, the quantity 1/T1T increases with decreasing temperature to Tc, indicating that the existence of antiferromagnetic correlation originating from its multiple electronic band structure. On the other hand, LaNiAsO1-xFx shows a clear HebelSlichter (coherence) peak just below Tc, evidencing that the LaNiAsO1-xFx is a BCS superconductor. In the normal state, 1/T1T is constant in the temperature range 4≤T≤10K for all LaNiAsO1-xFx, which indicates electron correlations are weak. We suggest that the contrasting behavior of both superconductivity and electron correlations in LaFeAsO0.92F0.08 and LaNiAsO 1-xFx between them relate to the difference of electronic band structure configuration. We also provide a possible interpretation for the pseudogap-like behavior in the normal state observed in both compounds.

Original languageEnglish
Pages (from-to)497-500
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Volume72
Issue number5
DOIs
Publication statusPublished - May 2011

Fingerprint

Nuclear quadrupole resonance
nuclear quadrupole resonance
Superconductivity
Electron correlations
superconductivity
Band structure
Superconducting materials
Spin-lattice relaxation
electronics
spin-lattice relaxation
nuclear spin
Temperature
temperature
electrons
configurations

Keywords

  • D. Nuclear quadrupole resonance
  • D. Superconductivity

ASJC Scopus subject areas

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

Cite this

As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni). / Oka, T.; Tabuchi, T.; Li, Z.; Kawasaki, Shinji; Chen, G. F.; Luo, J. L.; Wang, N. L.; Zheng, Guo-Qing.

In: Journal of Physics and Chemistry of Solids, Vol. 72, No. 5, 05.2011, p. 497-500.

Research output: Contribution to journalArticle

Oka, T. ; Tabuchi, T. ; Li, Z. ; Kawasaki, Shinji ; Chen, G. F. ; Luo, J. L. ; Wang, N. L. ; Zheng, Guo-Qing. / As-NQR study of superconductivity in LaRAsO1-xFx (R=Fe and Ni). In: Journal of Physics and Chemistry of Solids. 2011 ; Vol. 72, No. 5. pp. 497-500.
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AU - Luo, J. L.

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AB - We report 75As nuclear quadrupole resonance (NQR) studies on oxypnictide superconductors LaFeAsO1-xFx (x=0.08, 0.15) and LaNiAsO1-xFx (x=0, 0.06, 0.10, 0.12). In LaFeAsO 0.92F0.08 (Tc=23 K), nuclear spin-lattice relaxation rate 1/T1 shows no coherence peak just below Tc and decreases with decreasing temperature accompanied by a hump structure at T∼0.4Tc, which is a characteristic of the multigap superconductivity. In the normal state, the quantity 1/T1T increases with decreasing temperature to Tc, indicating that the existence of antiferromagnetic correlation originating from its multiple electronic band structure. On the other hand, LaNiAsO1-xFx shows a clear HebelSlichter (coherence) peak just below Tc, evidencing that the LaNiAsO1-xFx is a BCS superconductor. In the normal state, 1/T1T is constant in the temperature range 4≤T≤10K for all LaNiAsO1-xFx, which indicates electron correlations are weak. We suggest that the contrasting behavior of both superconductivity and electron correlations in LaFeAsO0.92F0.08 and LaNiAsO 1-xFx between them relate to the difference of electronic band structure configuration. We also provide a possible interpretation for the pseudogap-like behavior in the normal state observed in both compounds.

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