Second-order phase transition with coexistence of short-range and long-range ferromagnetic interactions in Ba1.7La0.3FeMoO6 compound

作者：Tran Dang Thanh; Oh Suhk Kun; Kim Dong Hyun; Yu Seong Cho^*; Demyanov S E; Kalanda N A; Yarmolich M V; Kovalev L V

来源：Current Applied Physics, 2014, 14(6): 886-891.

DOI：10.1016/j.cap.2014.03.019

• Double perovskites
• Critical behavior
• Magnetic phase transition

In this work, the magnetic properties and critical behavior around ferromagnetic-paramagnetic (FM-PM) phase transition in Ba1.7La0.3FeMoO6 compound have been investigated in detail. This compound exhibits a second-order magnetic phase transition with Curie temperature TC 345 K. The critical exponents beta, gamma, and delta that are determined by using the modified Arrott plots (MAP), the Kouvel-Fisher (KF) and the critical isotherm analysis agree very well. Our results indicate a coexistence of short-range and long-range ferromagnetic (FM) interactions in Ba1.7La0.3FeMoO6 compound. The existence of long-range FM interactions in this compound can be associated with the crystal structure of materials with long-range Fe/Mo ordering parameter and strength of double-exchange interaction, whereas the existence of the short-range FM interactions can be explained by magnetic inhomogeneity and FM clusters.

• 出版日期2014-6