Terahertz Spin-Orbital Excitations in the paramagnetic state of multiferroic Sr${}_2$FeSi${}_2$O${}_7$

Thuc T. Mai, C. Svoboda, M. T. Warren +5

We studied the novel multiferroic material Sr${}_2$FeSi${}_2$O${}_7$, and found 3 absorption modes above the magnetic ordering transition temperature using time-domain terahertz spectros…