A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?

Details A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates? A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?

2000-12-14

arxiv.org/abs/cond-mat/0012261v1

Europhys. Lett. 53 (2001) 354

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1209/epl/i2001-00161-8

CeIrIn5 is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific heat coefficient of 720 mJ/mol-K2. It exhibits a bulk, thermodynamic transition to a superconducting state at Tc=0.40 K, below which the specific heat decreases as T2 to a small residual T-linear value. Surprisingly, the electrical resistivity drops below instrumental resolution at a much higher temperature T0=1.2 K. These behaviors are highly reproducible and field-dependent studies indicate that T0 and Tc arise from the same underlying electronic structure. The layered crystal structure of CeIrIn5 suggests a possible analogy to the cuprates in which spin/charge pair correlations develop well above Tc.

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