2003/05/28 by R. Mahendiran, Y. Breard, Mahendiran, R. +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Magnetic Properties of Alloys #Magnetic and transport properties of perovskites and related materials #Materials Science (cond-mat.mtrl-sci) #Shape Memory Alloy Transformations #cond-mat.mtrl-sci
paper · pdf · doi:10.48550/arxiv.cond-mat/0305653
18 pages including 6 figures
arxiv created 2003/05/28 · openalex publication_date 2003/05/28 · arxiv updated 2009/11/30 · openalex created_date 2022/10/04 · openalex updated_date 2026/07/28
We have investigated the magnetic properties of nanocrystalline LaCo0.5Mn0.5O3. The temperature dependence of the imaginary part of the a.c. susceptibility shows a strongly frequency dependent maximum at a temperature, Tf, which is well below the ferromagnetic transition temperature (TC ~ 230 K). The frequency dependence of Tf obeys the Arrhenius relation, f = foexp(-Ea/kBT), with physically reasonable values of fo = 109 Hz and Ea/kB = 1518 K. The frequency shift of Tf per decade of frequency is one of the highest values observed in any magnetic system, and a similarly large value is also found in LaCo0.4Mg0.1Mn0.5O3, suggesting that such behavior is intrinsic despite the apparent presence of long range ferromagnetic order.