As-NMR/NQR study of pressure-induced superconductivity in CaFe 2As2

S. Kawasaki; T. Oka; T. Tabuchi; X. F. Wang; X. H. Chen; Guo Qing Zheng

doi:10.1016/j.jpcs.2010.10.010

As-NMR/NQR study of pressure-induced superconductivity in CaFe ₂As₂

S. Kawasaki, T. Oka, T. Tabuchi, X. F. Wang, X. H. Chen, Guo Qing Zheng

Research output: Contribution to journal › Article

4 Citations (Scopus)

Abstract

⁷⁵As-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe₂As ₂ under pressure. At P=4.7 and 10.8 kbar, the temperature dependence of nuclear-spin-lattice relaxation rate (1/T₁) measured at tetragonal phase show no coherence peak just below T_c and decrease with decreasing temperature. The superconductivity is of gapless at P=4.7 kbar but evolves to multiple gaps at P=10.8 kbar. We find that the superconductivity appears near a quantum critical point. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound.

Original language	English
Pages (from-to)	501-504
Number of pages	4
Journal	Journal of Physics and Chemistry of Solids
Volume	72
Issue number	5
DOIs	https://doi.org/10.1016/j.jpcs.2010.10.010
Publication status	Published - May 1 2011

Keywords

D. Nuclear magnetic resonance
D. Nuclear quadrupole resonance
D. Superconductivity

ASJC Scopus subject areas

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

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Kawasaki, S., Oka, T., Tabuchi, T., Wang, X. F., Chen, X. H., & Zheng, G. Q. (2011). As-NMR/NQR study of pressure-induced superconductivity in CaFe ₂As₂. Journal of Physics and Chemistry of Solids, 72(5), 501-504. https://doi.org/10.1016/j.jpcs.2010.10.010

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AU - Kawasaki, S.

AU - Oka, T.

AU - Tabuchi, T.

AU - Wang, X. F.

AU - Chen, X. H.

AU - Zheng, Guo Qing

PY - 2011/5/1

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N2 - 75As-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As 2 under pressure. At P=4.7 and 10.8 kbar, the temperature dependence of nuclear-spin-lattice relaxation rate (1/T1) measured at tetragonal phase show no coherence peak just below Tc and decrease with decreasing temperature. The superconductivity is of gapless at P=4.7 kbar but evolves to multiple gaps at P=10.8 kbar. We find that the superconductivity appears near a quantum critical point. Both electron correlation and superconductivity disappear in the collapsed tetragonal phase. A systematic study under pressure indicates that electron correlations play a vital role in forming Cooper pairs in this compound.

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KW - D. Nuclear quadrupole resonance

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