Physics – Condensed Matter – Superconductivity
Scientific paper
2001-02-27
Phys. Rev. Lett. vol.86, pp 4664-4667 (2001)
Physics
Condensed Matter
Superconductivity
minor changes, appeared in PRL (4 pages, 4 figures)
Scientific paper
10.1103/PhysRevLett.86.4664
We report measurements of the ^{115}In nuclear spin-lattice relaxation rate (1/T_1) between T=0.09 K and 100 K in the new heavy fermion (HF) compound CeIrIn_5. At 0.4 K < T < 100 K, 1/T_1 is strongly T-dependent, which indicates that CeIrIn_5 is much more itinerant than known Ce-based HFs. We find that 1/T_1T, subtracting that for LaIrIn_5, follows a 1/(T+\theta)^{3/4} variation with \theta=8 K. We argue that this novel feature points to anisotropic, due to a layered crystal structure, spin fluctuations near a magnetic ordering. The bulk superconductivity sets in at 0.40 K below which the coherence peak is absent and 1/T_1 follows a T^3 variation, which suggests unconventional superconductivity with line-node gap.
Aoki Dai
Haga Yoshinori
Kawasaki Shigeo
Kitaoka Yoshio
Mito Takeshi
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