Superconductivity and non-Fermi liquid behavior near antiferromagnetic quantum critical points in CeRh1−xCoxIn5
J. R. Jeffries, N. A. Frederick, E. D. Bauer, Hikari Kimura, V. S. Zapf, K.-D. Hof, T. A. Sayles, M. B. Maple
DOI 10.1103/PhysRevB.72.024551 · Physical Review B
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Abstract
Single crystals of CeRh1−xCoxIn5 have been investigated by means of specific heat measurements at zero pressure and electrical resistivity measurements under nearly hydrostatic pressure up to 28kbar. Specific heat measurements for samples of CeRh1−xCoxIn5 with cobalt concentrations of x=0.65, 0.71, 0.77, 0.87, and 0.93 confirm the existence of antiferromagnetism for 0⩽x⩽0.7 and suggest the existence of a quantum critical point at xc∼0.75. Entropy versus x isotherms below ∼5K and the normalized residual resistivity ρ(0K)∕ρ(290K) versus x curve both display maxima near xc∼0.75, suggesting further evidence for the existence and location of the quantum critical point. Electrical resistivity measurements under pressure for samples with x=0.1, 0.2, 0.4, and 0.6 reveal antiferromagnetism, pressure-induced superconductivity, and the coexistence of antiferromagnetism and superconductivity. Normalized residual resistivity ρ(0K)∕ρ(290K) versus pressure P curves and the evolution of the power-law exponent n favor the existence of quantum critical points at critical pressures Pc∼23kbar, ∼21kbar, and ∼7kbar for samples with x=0.1, 0.2, and 0.4, respectively.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CeRhIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.8 | Pressure unresolved | unknown |
| CeIrIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.4 | Pressure unresolved | unknown |
| CeCoIn5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.3 | Pressure unresolved | unknown |
| CeRh0.6Co0.4In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.43 | Pressure unresolved | unknown |
| CeRh0.4Co0.6In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.89 | Pressure unresolved | unknown |
| CeRh0.9Co0.1In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.11 | 0.69 GPa | unknown |
| CeRh0.8Co0.2In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.82 | 0.88 GPa | unknown |
| CeRh0.35Co0.65In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.38 | Pressure unresolved | unknown |
| CeRh0.29Co0.71In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.56 | Pressure unresolved | unknown |
| CeRh0.23Co0.77In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.38 | Pressure unresolved | unknown |
| CeRh0.13Co0.87In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.73 | Pressure unresolved | unknown |
| CeRh0.07Co0.93In5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.89 | Pressure unresolved | unknown |
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