Superconducting properties of lanthanum selenide

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Abstract
Superconductivity phenomena in lanthanum selenide crystals with different electron concentration are observed. The parameters describing the superconducting state, in particular the critical temperature Tc and the lower critical field Hcl, are determined from measurements of the resistivity transition, the magnetic susceptibility and the Meissner effect on samples with various electron concentrations. From the experimental results the Ginzburg‐Landau parameter χ, the penetration depth λd, coherence length ξd, the Gorkov impurity parameter ϱ, etc. are deduced. The dependence of the critical temperature Tc on electron concentration is calculated on the basis of McMillan's theory and compared with experiment.