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Superconducting properties of lanthanum selenide
Author(s) -
Sosnowski J.
Publication year - 1975
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220720145
Subject(s) - superconductivity , condensed matter physics , selenide , critical field , penetration depth , coherence length , meissner effect , lanthanum , electrical resistivity and conductivity , superconducting coherence length , impurity , ginzburg–landau theory , london penetration depth , materials science , magnetic field , transition temperature , electron , physics , chemistry , inorganic chemistry , quantum mechanics , selenium , metallurgy
Superconductivity phenomena in lanthanum selenide crystals with different electron concentration are observed. The parameters describing the superconducting state, in particular the critical temperature T c and the lower critical field H cl , 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 λ d , coherence length ξ d , the Gorkov impurity parameter ϱ, etc. are deduced. The dependence of the critical temperature T c on electron concentration is calculated on the basis of McMillan's theory and compared with experiment.