Anomalous lattice specific heat and rattling phonon modes in quadruple perovskites

Valentin Yu. Irkhin, Zhehong Liu, Danil A. Myakotnikov +3

Experimental data on the specific heat $C_p$ of quadruple perovskites ACu${}_3$Fe${}_2$Re${}_2$O${}_{12}$ (A = Mn, Cu, La, Ce, Dy) are presented, demonstrating an anomalous concave-down $C…