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 journalArticlepeer-review

4 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)501-504
Number of pages4
JournalJournal of Physics and Chemistry of Solids
Issue number5
Publication statusPublished - May 2011


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

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics


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