Abstract
Positive hydrostatic pressure was applied on YIn3 and variation in superconducting transition temperature (T-c) and average coupling constant (lambda(ep)) was observed. The variation in phonon dispersion relation, Eliashberg spectral function, phonon DOS and average logarithmic phonon frequency was studied with an increase in positive hydrostatic pressure. The dispersion relation for YIn3 under ambient and all applied positive pressure shows positive frequency for all modes of vibrations signifying the structural stability of YIn3 under all applied pressures.