NMR and NQR studies of the heavy fermion superconductors CeTIn5 (T=Co and Ir)
Y. Kohori, Y. Yamato, Y. Iwamoto, T. Kohara, E. D. Bauer, M. B. Maple, J. L. Sarrao
DOI 10.1103/PhysRevB.64.134526 · Physical Review B
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Abstract
We have carried out 115In and 59Co nuclear quadrupole resonance and nuclear magnetic resonance measurements on CeCoIn5 and CeIrIn5. The temperature T dependence of the nuclear spin-lattice relaxation rate 1/T1 of 115In in the normal state indicates that CeCoIn5 is located just at an antiferromagnetic instability, and CeIrIn5 is in the nearly antiferromagnetic region. In the superconducting state, 1/T1 has no Hebel-Slichter coherence peak just below TC and a power-law T dependence (close to 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 in the superconducting state, which shows that the spin susceptibility decreases in all directions. These results indicate that CeCoIn5 and CeIrIn5 exhibit non-s-wave even parity (probably d-wave) superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure unresolved | unknown |
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure unresolved | unknown |
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.2 | 1.6 GPa | unknown |
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