Phonons, Q-dependent Kondo spin fluctuations, and 4$\text{f}$/phonon resonance in YbAl${}_3$

Andrew D. Christianson, Victor R. Fanelli, Lucas Lindsay +7

The intermediate valence (IV) compound YbAl${}_3$ exhibits nonintegral valence (Yb 4$f^{14-n_f}$ (5d6s)${}^z$ where z = 2+n${}_f$ = 2.75) in a moderately heavy (m* = 20-30me) ground stat…