C. Petrovic et al 2001 Europhys. Lett. 53 354 doi:10.1209/epl/i2001-00161-8
C. Petrovic1,2, R. Movshovich1, M. Jaime1, P. G. Pagliuso1, M. F. Hundley1, J. L. Sarrao1, Z. Fisk1,2 and J. D. Thompson1
Show affiliationsCeIrIn5 is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific-heat coefficient of 720 mJ/molK2. 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.
74.70.Tx Heavy-fermion superconductors
71.27.+a Strongly correlated electron systems; heavy fermions
Issue 3 (February 2001)
Received 18 July 2000, accepted for publication 22 November 2000, in final form 22 November 2000
C. Petrovic et al 2001 Europhys. Lett. 53 354
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