Thermodynamics of paramagnetic-ferromagnetic phase transition in La 0.7Ca0.3MnO3 Manganite: Griffiths singularity versus chemical disorder and lattice effects

Evgeny Rozenberg; Mark Auslender; I. Felner; Alexander I. Shames; G. Gorodetsky; Ya M. Mukovskii

doi:10.1109/TMAG.2010.2045345

Thermodynamics of paramagnetic-ferromagnetic phase transition in La _0.7Ca_0.3MnO₃ Manganite: Griffiths singularity versus chemical disorder and lattice effects

Evgeny Rozenberg^*, Mark Auslender, I. Felner, Alexander I. Shames, G. Gorodetsky, Ya M. Mukovskii

^*Corresponding author for this work

Racah Institute of Physics

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

15 Scopus citations

Abstract

Magnetic and electron paramagnetic resonance measurements were employed to probe magnetic interactions in the single crystal and ceramic of La _0.7Ca_0.3MnO₃ manganite in the vicinity and above their paramagnetic-ferromagnetic phase transition. It is shown that strong differences in the Curie point values and in the temperature dependences of inverse susceptibilities are observed in spite of the same structure and cation composition of both samples. We suggest that the difference between lattice effects in these samples, induced by their different chemical disorder, proves a more realistic description of experimental data than so-called Griffiths singularity.

Original language	English
Article number	5467526
Pages (from-to)	1299-1302
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	46
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2010.2045345
State	Published - Jun 2010

Keywords

Magnetic susceptibility
Magnetization processes
Manganese compounds

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10.1109/TMAG.2010.2045345

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abstract = "Magnetic and electron paramagnetic resonance measurements were employed to probe magnetic interactions in the single crystal and ceramic of La 0.7Ca0.3MnO3 manganite in the vicinity and above their paramagnetic-ferromagnetic phase transition. It is shown that strong differences in the Curie point values and in the temperature dependences of inverse susceptibilities are observed in spite of the same structure and cation composition of both samples. We suggest that the difference between lattice effects in these samples, induced by their different chemical disorder, proves a more realistic description of experimental data than so-called Griffiths singularity.",

keywords = "Magnetic susceptibility, Magnetization processes, Manganese compounds",

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year = "2010",

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AU - Rozenberg, Evgeny

AU - Auslender, Mark

AU - Felner, I.

AU - Shames, Alexander I.

AU - Gorodetsky, G.

AU - Mukovskii, Ya M.

PY - 2010/6

Y1 - 2010/6

N2 - Magnetic and electron paramagnetic resonance measurements were employed to probe magnetic interactions in the single crystal and ceramic of La 0.7Ca0.3MnO3 manganite in the vicinity and above their paramagnetic-ferromagnetic phase transition. It is shown that strong differences in the Curie point values and in the temperature dependences of inverse susceptibilities are observed in spite of the same structure and cation composition of both samples. We suggest that the difference between lattice effects in these samples, induced by their different chemical disorder, proves a more realistic description of experimental data than so-called Griffiths singularity.

AB - Magnetic and electron paramagnetic resonance measurements were employed to probe magnetic interactions in the single crystal and ceramic of La 0.7Ca0.3MnO3 manganite in the vicinity and above their paramagnetic-ferromagnetic phase transition. It is shown that strong differences in the Curie point values and in the temperature dependences of inverse susceptibilities are observed in spite of the same structure and cation composition of both samples. We suggest that the difference between lattice effects in these samples, induced by their different chemical disorder, proves a more realistic description of experimental data than so-called Griffiths singularity.

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KW - Magnetization processes

KW - Manganese compounds

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Thermodynamics of paramagnetic-ferromagnetic phase transition in La _0.7Ca_0.3MnO₃ Manganite: Griffiths singularity versus chemical disorder and lattice effects

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