Abstract
Superconducting materials of Li2Pd3B and Li2Pt3B were identified. These materials show a superconducting transition at temperatures of 7.5K and 2.17K, respectively. They have a cubic structure composed of distorted Pd6B octahedrons, and their superconductivity is induced by Li addition. Li contains a single valence electron and reacts strongly to most materials. Furthermore, it easily occupies interstitial sites while maintaining its structure. The samples were prepared by a two-stage arc-melting method followed by an annealing process. The specific heat measurements were carried out by heat-pulse relaxation and semi-adiabatic methods. The Sommerfeld (γT) and Debye (βT3) terms of Li2Pd3B from a conventional formula C=γT+βT3 were given as γ=9.0mJmol−1K−2 and β=1.08mJmol−1K−1, respectively. The Debye temperature was θD=221K. The value of ΔC/γT at Tc was calculated to be 2.0. The same parameters were described for Li2Pt3B as γ=7.0mJmol−1K−2, β=0.98mJmol−1K−1, θD=228K, and ΔC/γTc=1.39. The pressure effect was measured with a SQUID magnetometer using a low-temperature hydrostatic micro-pressure cell. The result of dTc/dP showed a negative effect on the superconducting transition temperature of Li2Pd3B.
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