On the origin of the zero-resistance anomaly in heavy fermion superconducting Ir: a clue from magnetic field and Rh-doping studies

Abstract

We present the results of the specific heat and AC magnetic susceptibility measurements of $CeI{r}_{1-x}R{h}_{x}I{n}_5$ for x from 0 to 0.5. As x is increased from 0 both quantities reflect the competition between two effects. The first is a suppression of superconductivity below the bulk transition temperature of T${}_c=0.4$ K, which is due to the pair breaking effect of Rh impurities. The second is an increase in the volume fraction of the superconducting regions above T${}_c$, which we attribute to defect-induced strain. Analysis of the H-T phase diagram for CeIrIn${}_5$obtained from the bulk probes and resistance measurements points to the filamentary origin of the inhomogeneous superconductivity at T${}_{\rho }\approx 1.2$ K, where the resistance drops to zero. The identical anisotropies in the magnetic field dependence of the specific heat and the resistance anomalies in CeIrIn${}_5$ indicate that the filamentary superconductivity is intrinsic, involving electrons from the part of the Fermi surface responsible for bulk superconductivity.

4 pages

References in corpus (3)

• A New Heavy-Fermion Superconductor CeIrIn5: Relative of the Cuprates?
• Coexistence of magnetism and superconductivity in CeRh1-xIrxIn5
• Unique Spin Dynamics and Unconventional Superconductivity in the Layered Heavy Fermion Compound CeIrIn_5:NQR Evidence

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