Origin of the zero-resistance anomaly in heavy fermion superconducting CeIrIn5: A clue from magnetic-field and Rh-doping studies
A. Bianchi, R. Movshovich, M. Jaime, J. D. Thompson, P. G. Pagliuso, J. L. Sarrao
DOI 10.1103/PhysRevB.64.220504 · Physical Review B
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Abstract
We present the results of the specific heat and ac magnetic susceptibility measurements of CeIr1−xRhxIn5 for x from 0 to 0.5. As x is increased from zero both quantities reflect the competition between two effects. The first is a suppression of superconductivity below the bulk transition temperature of Tc=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 Tc, which we attribute to defect-induced strain. Analysis of the H−T phase diagram for CeIrIn5 obtained from the bulk probes and resistance measurements points to the filamentary origin of the inhomogeneous superconductivity at Tρ≈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 CeIrIn5 indicate that the filamentary superconductivity is intrinsic, involving electrons from the part of the Fermi surface responsible for bulk superconductivity.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure unresolved | midpoint |
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.2 | Pressure unresolved | zero_resistance |
| CeIr0.9Rh0.1In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.28 | Pressure unresolved | midpoint |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure unresolved | unknown |
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