Journal
EUROPHYSICS LETTERS
Volume 53, Issue 3, Pages 354-359Publisher
E D P SCIENCES
DOI: 10.1209/epl/i2001-00161-8
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CeIrIn5 is a member of a new family of heavy-fermion compounds and has a Sommerfeld specific-heat coefficient of 720 mJ/molK(2). It exhibits a bulk, thermodynamic transition to a superconducting state at T-c = 0.40 K: below which the specific heat decreases as T-2 to a small residual T-linear value. Surprisingly, the electrical resistivity drops below instrumental resolution at a much higher temperature T-0 = 1.2 K. These behaviors are highly reproducible and field-dependent studies indicate that T-0 and T-c 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 a ell above T-c.
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