Acta Physica Polonica B

Vol. 34, No. 2, February 2003, page 435

Unconventional Superconductivity and Quasi-2D Magnetic Fluctuations in Ce(Ir,Rh)In5

G.-q. Zheng, K. Tanabe, S. Kawasaki, H. Kan, Y. Kitaoka, D. Aoki, Y. Haga, Y. Onuki

The 115In nuclear spin--lattice relaxation rate (1/T1) measurements are reported for the heavy fermion (HF) compounds Ce(Ir,Rh)In5 along with their La analogs La(Ir,Rh)In5. 1/T1 for Ce(Ir,Rh)In5 is enhanced by one order of magnitude over that in La(Ir,Rh)In5, indicating strong magnetic fluctuations in these compounds. It is evidenced that CeIrIn5 is located near a quantum critical point, with quasi-2D spin fluctuations. Also in CeIrIn5, 1/T1 follows a T3 variation below Tc=0.40 K, indicating unconventional superconductivity with line-node gap. These aspects are reminiscent of the high-Tc copper oxides and suggest the importance of the magnetic fluctuations for the occurrence of the unconventional superconductivity in these HF compounds.

PACS numbers: 74.25.Ha, 74.70Tx. 76.60.Gv

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