Discovery of Li2(Pd,Pt)3B superconductors

Details Discovery of Li2(Pd,Pt)3B superconductors Discovery of Li2(Pd,Pt)3B superconductors

2006-07-25

arxiv.org/abs/cond-mat/0607626v1

Physics

Condensed Matter

Superconductivity

6 pages, 5 figs. presented at M2S, 2006

Scientific paper

10.1016/j.physc.2007.03.163

Critical temperature Tc of the Li2(Pd1-xPtx)3B was reported to be 7-8K for x=0 and 2.2-2.8K for x=1. In this article we present our preliminary results on behavior of magnetization-temperature curves with starting composition of Pd-B precursor, y-Li concentration in LiyPd3B and post-annealing of the Pd-end compound. Results suggest that to maximize Tc ratio Pd:B should be close to 3:1, while y-Li has to be optimum. The lowest Tc for LiyPd3B was 4.4-4.6K, while post-annealings at 560 deg. C allowed enhancement of Tc up to 8.2-8.4K. Compositions Li2Z3B with Z=Ni, Ru, Rh, Re, Ag are not superconducting down to 1.8K. Exception is composition with Re showing superconductivity due to Re3B compound. All samples were prepared by arc melting.

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