Dielectric Relaxations And Magnetodielectric Response In Bimn2o5 Single Crystal

Magnetic and dielectric properties have been investigated on BiMn2O5 single crystals. Magnetic measurements show that BiMn2O5 becomes antiferromagnetic below T-N similar to 39K, with short range magnetic correlation existing between TN and T* similar to 100K. Three thermally excited dielectric relaxations at temperatures T-N < T < 300K and large intrinsic magnetodielectric effect due to the special arrangement of Mn3+/Mn4+ ions associated with electron hopping between them were observed. The low temperature anisotropic relaxation (TN < T < T*) along the b-axis, which is insignificant along the c-axis, can be ascribed to electron hopping between the zigzag chains with short range magnetic correlation. The other two dielectric relaxations are also discussed. (C) 2013 AIP Publishing LLC.