Acoustic study for dynamical molecular-spin state without undergoing magnetic phase transition in spin-frustrated ZnFe${}_2$O${}_4$

Tadataka Watanabe, Shota Takita, Keisuke Tomiyasu +1

Ultrasound velocity measurements were performed on a single crystal of spin-frustrated ferrite spinel ZnFe${}_2$O${}_4$ from 300 K down to 2 K. In this cubic crystal, all the symmetric…