Goldstone modes and electromagnon fluctuations in the conical cycloid state of a multiferroic

Sumanta Tewari, Chuanwei Zhang, John Toner +1

Using a phenomenological Ginzburg-Landau theory for the magnetic conical cycloid state of a multiferroic, which has been recently reported in the cubic spinel CoCr${}_2$O${}_4$, we…