Softening of breathing elastic mode and trigonal elastic mode in disordered pyrochlore magnet NaCaCo${}_2$F${}_7$

T. Watanabe, H. Kato, Y. Hara +2

Cobalt pyrochlore fluoride NaCaCo${}_2$F${}_7$ is a disordered frustrated magnet composed of Co${}^{2+}$ ions with an effective spin-$\frac{1}{2}$ magnetic moment and exhibits spin freez…