Superconductivity in the ternary nickel silicide Lu2Ni3Si5
Chandan Mazumdar, K. Ghosh, S. Ramakrishnan, R. Nagarajan, L. C. Gupta, G. Chandra, B. D. Padalia, R. Vijayaraghavan
DOI 10.1103/PhysRevB.50.13879 · Physical Review B
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Abstract
The synthesis and results of electrical-resistivity (1.5–300 K), ac-magnetic-susceptibility (1.5–5 K), and specific-heat (1.7–30 K) measurements are reported on a ternary rare-earth–nickel-silicide compound Lu2Ni3Si5. The compound is found to be superconducting below 2.1 K. The magnetic-susceptibility measurements show the onset of diamagnetism at 2.1 K and the resistivity goes to zero at 2.0 K with the same onset temperature. The resistivity above the transition temperature shows a metallic behavior. A deviation from linear resistivity at high temperatures implies a short mean free path. The heat capacity shows a jump with a peak at 1.9 K, which indicates bulk superconducting ordering in this sample. The estimated value for γ(=Cp/T as T→0) is 5.8 mJ/Lu molK2 and ΔCp/γTc is 1.1, which is lower than the BCS value of 1.43. From these results, we conclude that Lu2Ni3Si5 is a weak-coupling BCS superconductor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Lu2Ni3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2.1 | Pressure not reported | onset |
| Lu2Ni3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 2 | Pressure not reported | zero_resistance |
| Lu2Ni3Si5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.9 | Pressure not reported | midpoint |
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