Abstract
We have carried out 115In and 59Co nuclear quadrupole resonance and nuclear magnetic resonance measurements on CeTIn5 (T=Co, Rh and Ir). The temperature T- and the pressure P-dependence of the nuclear spin-lattice relaxation rate 1/T1 of 115In in CeTIn5 indicated that the superconductivity occurred close to an antiferromagnetic instability. In the superconducting state, 1/T1 has no Hebel–Slichter coherence peak just below TC and a power-law T-dependence (1/T1∼T3) at very low temperatures, which indicates the existence of line nodes in the superconducting energy gap. The 115In (Ce–In plane) Knight shift in CeCoIn5 decreases for both parallel and perpendicular directions to the tetragonal c-axis below TC, which shows that the spin susceptibility decreases in all directions. These results indicate that CeTIn5 (T=Co, Rh and Ir) exhibit non-s-wave even parity (probably d-wave) superconductivity.
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