Superconductivity in the ternary nickel silicide Lu2Ni3Si5

Mazumdar, Chandan ; Ghosh, K. ; Ramakrishnan, S. ; Nagarajan, R. ; Gupta, L. C. ; Chandra, G. ; Padalia, B. D. ; Vijayaraghavan, R. (1994) Superconductivity in the ternary nickel silicide Lu2Ni3Si5 Physical Review B: Condensed Matter and Materials Physics, 50 (18). pp. 13879-13882. ISSN 1098-0121

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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.

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Source:Copyright of this article belongs to The American Physical Society.
ID Code:61593
Deposited On:15 Sep 2011 11:56
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