As-NMR/NQR study of CaFe2As2 under pressure

Shinji Kawasaki, Toshihide Oka, Takahisa Tabuchi, X. F. Wang, X. H. Chen, Guo Qing Zheng

Research output: Contribution to journalArticlepeer-review


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
Article numberSA116
Journaljournal of the physical society of japan
Issue numberSUPPL. A
Publication statusPublished - Jul 2011


  • CaFeAs
  • Pressure
  • Quantum critical point
  • Superconductivity

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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