Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2

Details Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2 Pressure-induced unconventional superconductivity near a quantum critical point in CaFe2As2

2010-02-05

arxiv.org/abs/1002.1114v2

Supercond. Sci. Technol. 23, 054004 (2010).

Physics

Condensed Matter

Superconductivity

5pages, 5figures

Scientific paper

75As-zero-field nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements are performed on CaFe2As2 under pressure. At P = 4.7 and 10.8 kbar, the temperature dependences of nuclear-spin-lattice relaxation rate (1/T1) measured in the tetragonal phase show no coherence peak just below Tc(P) and decrease with decreasing temperature. The superconductivity is gapless at P = 4.7 kbar but evolves to that with multiple gaps at P = 10.8 kbar. We find that the superconductivity appears near a quantum critical point under pressures in the range 4.7 kbar < P < 10.8 kbar. 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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