Taehun Kim, Sumin Lim, Jaeyoung Hong, Soon Gu Kwon, Jun Okamoto, Zhi Ying Chen, Jaehong Jeong, Soonmin Kang, Jonathan C Leiner, Jung Tae Lim, Chul Sung Kim, Di Jing Huang, Taeghwan Hyeon, Soonchil Lee, Je-Geun Park
Most interesting phenomena of condensed matter physics originate from interactions among different degrees of freedom, making it a very intriguing yet challenging question how certain ground states emerge from only a limited number of atoms in assembly. This is especially the case for strongly correlated electron systems with overwhelming complexity. The Verwey transition of Fe3 O4 is a classic example of this category, of which the origin is still elusive 80 years after the first report. Here we report, for the first time, that the Verwey transition of Fe3 O4 nanoparticles exhibits size-dependent thermal hysteresis in magnetization,57 Fe NMR, and XRD measurements...
March 23, 2018: Scientific Reports