Superconductivity in the Ni-based ternary compound LaNiGa2
N. L. Zeng, W. H. Lee
DOI 10.1103/PhysRevB.66.092503 · Physical Review B
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Abstract
The agreement of the transition temperature Tc=1.93–2.01K (10–90 % values), measured by dc susceptibility and heat-capacity techniques, provides clear evidence of bulk superconductivity in LaNiGa2. The normal-state specific-heat data can be fit to the expression Cn=γT+βT3 by a least squares analysis, where γ=11.64±0.05mJ/molK2 and β=0.332±0.06mJ/molK4, resulting in a Debye temperature θD=560±10K. Below Tc, the specific-heat data have a dominant low-temperature behavior of the form exp[−Δ(0)/kBT], where the order parameter 2Δ(0)=3.2kBTc. In addition, the measured heat-capacity jump ΔC(=32±2mJ/molK) at the transition point is found to be equal to 1.40γTc, implying that LaNiGa2 is a weakly coupled superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaNiGa2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.97 | Pressure not reported | midpoint |
| LaNiGa2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.97 | Pressure not reported | midpoint |
| LaNiGa2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.05 | Pressure not reported | zero_resistance |
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