Superconducting and magnetic properties of the heavy-fermion compounds UT2Al3 (T=Ni,Pd)
Y. Dalichaouch, M. C. de Andrade, M. B. Maple
DOI 10.1103/PhysRevB.46.8671 · Physical Review B
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Abstract
The resistive upper critical field Hc2 as a function of temperature T has been determined for polycrystalline specimens of the isostructural antiferromagnetic heavy-fermion superconductors UT2Al3 (T=Ni, Pd). The zero-temperature superconducting coherence lengths ξ0=190 Å (77 Å) for T=Ni (Pd) have been estimated from the initial slope of Hc2(T), and analyses of previously reported specific-heat data yield an effective mass enhancement m*/me∼40 (49) for T=Ni (Pd), where me is the free-electron mass. High-precision measurements of the normal-state electrical resistivity reveal a broad anomaly below 4.6 K in UNi2Al3, which correlates with the onset of U-moment antiferromagnetic ordering. In UPd2Al3, the large electrical resistivity drop between Tc and TN≊15 K can be accurately described by an expression that is appropriate for an antiferromagnet with an energy gap Δ≊40 K and an additional T2 term reflecting Fermi-liquid behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| UNi2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | midpoint |
| UPd2Al3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | midpoint |
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