Giant frequency dependence of dynamic freezing in nanocrystalline ferromagnetic LaCo0.5Mn0.5O3

R. Mahendiran, Y. Bréard, M. Hervieu, B. Raveau, P. Schiffer

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We have investigated the magnetic properties of nanocrystalline LaCo0.5Mn0.5O3. The temperature dependence of the imaginary part of the ac 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=fo exp(-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.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
StatePublished - 2003
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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