Superconducting La 3 S 4 single crystals containing a definite number of cation vacancies are analysed by magnetic susceptibility, specific heat, upper critical magnetic field and low temperature X-ray diffraction measurements. The authors find experimental proof that the cubic to tetragonal distortion of the unit cell found in crystals close to stoichiometric La 3 S 4 is of Jahn-Teller band type. The strongest electron-phonon coupling and the maximum superconducting transition temperature is found when the cubic to tetragonal phase transformation is just suppressed by doping with vacancies.
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Westerholt et al. (1980) studied this question.
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