Strong electron-phonon coupling and enhanced phonon Grüneisen parameters in valence-fluctuating metal EuPd${}_2$Si${}_2$

Mai Ye, Mark Joachim Graf von Westarp, Sofia-Michaela Souliou +7

We study the valence crossover and strong electron-phonon coupling of EuPd${}_2$Si${}_2$ by polarization-resolved Raman spectroscopy. The fully-symmetric phonon mode shows strongly asy…