Abstract
The hydrostatic pressure and temperature dependences of the elastic stiffnesses of the cubic, Th3P4 structure compounds Ce3S4 and La3S4 have been measured using the ultrasonic pulse echo overlap technique. Although Ce3S4, unlike La3S4 (T c = 103 K), does not undergo a phase transition when its temperature is lowered to 16 K, its elastic stiffnesses (C11-C12)/2 and C11 soften with decreasing temperature (in a similar manner but less markedly than those of La3S4); this lattice instability indicates an incipient phase transition. In both compounds the elastic constants increase under pressure: the long-wavelength acoustic-mode Gruneisen parameters are all positive, and the application of pressure does not induce acoustic phonon-mode softening.
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