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

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

doi:10.1103/PhysRevB.68.104402

Giant frequency dependence of dynamic freezing in nanocrystalline ferromagnetic LaCo_0.5Mn_0.5O₃

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

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

We have investigated the magnetic properties of nanocrystalline LaCo_0.5Mn_0.5O₃. The temperature dependence of the imaginary part of the ac susceptibility shows a strongly frequency-dependent maximum at a temperature T_f, which is well below the ferromagnetic transition temperature (T_c∼230 K). The frequency dependence of T_f obeys the Arrhenius relation, f=f_o exp(-E_a/k_BT), with physically reasonable values of f_o=10⁹ Hz and E_a/k_B=1518 K. The frequency shift of T_f per decade of frequency is one of the highest values observed in any magnetic system, and a similarly large value is also found in LaCo_0.4Mg_0.1Mn_0.5O₃, suggesting that such behavior is intrinsic despite the apparent presence of long-range ferromagnetic order.

Original language	English (US)
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	68
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevB.68.104402
State	Published - 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1103/PhysRevB.68.104402

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title = "Giant frequency dependence of dynamic freezing in nanocrystalline ferromagnetic LaCo0.5Mn0.5O3",

abstract = "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.",

author = "R. Mahendiran and Y. Br{\'e}ard and M. Hervieu and B. Raveau and P. Schiffer",

year = "2003",

doi = "10.1103/PhysRevB.68.104402",

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journal = "Physical Review B - Condensed Matter and Materials Physics",

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T1 - Giant frequency dependence of dynamic freezing in nanocrystalline ferromagnetic LaCo0.5Mn0.5O3

AU - Mahendiran, R.

AU - Bréard, Y.

AU - Hervieu, M.

AU - Raveau, B.

AU - Schiffer, P.

PY - 2003

Y1 - 2003

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevB.68.104402

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IS - 10

ER -

Giant frequency dependence of dynamic freezing in nanocrystalline ferromagnetic LaCo_0.5Mn_0.5O₃

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