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

C. Petrovic·R. Movshovich·M. Jaime·P. G. Pagliuso·M. F. Hundley·J. L. Sarrao·Z. Fisk·J. D. Thompson
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Abstract

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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C. Petrovic, R. Movshovich, M. Jaime, P. G. Pagliuso, M. F. Hundley, J. L. Sarrao, Z. Fisk, J. D. Thompson. 2000-12-14. A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?. https://doi.org/10.1209/epl%2Fi2001-00161-8

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