Observation of elastic anomalies driven by coexisting dynamical spin Jahn-Teller effect and dynamical molecular spin state in paramagnetic phase of the frustrated MgCr${}_2$O${}_4$$

Tadataka Watanabe, Shin-Ichi Ishikawa, Haruki Suzuki +2

Ultrasound velocity measurements of magnesium chromite spinel MgCr${}_2$O${}_4$ reveal elastic anomalies in the paramagnetic phase that are characterized as due to geometrical frustrat…