Relaxation dynamics and colossal magnetocapacitive effect in CdCr2S4
  A thorough investigation of the relaxational dynamics in the recently discovered multiferroic CdCr2S4 showing a colossal magnetocapacitive effect has been performed. Broadband dielectric measurements without and with external magnetic fields up to 10 T provide clear evidence that the observed magnetocapacitive effect stems from enormous changes of the relaxation dynamics induced by the development of magnetic order. 
P. Lunkenheimer, R. Fichtl, J. Hemberger, V. Tsurkan, and A. Loidl