Electron magnetic resonance study of magnetic order, paramagnetic magnetic correlations, and spin dynamics in La- and Mn-deficient LaMnO3 manganites

Mark Auslender; Alexander Shames; Evgeny Rosenberg; Gad Gorodetsky; Ya M. Mukovskii

doi:10.1109/TMAG.2009.2024630

Electron magnetic resonance study of magnetic order, paramagnetic magnetic correlations, and spin dynamics in La- and Mn-deficient LaMnO₃ manganites

Mark Auslender, Alexander Shames, Evgeny Rosenberg, Gad Gorodetsky, Ya M. Mukovskii

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

1 Scopus citations

Abstract

To probe magnetic ordering in single crystals of La_1-x,MnO ₃ (x=0.01,0.05,0.13) and in ceramics of LaMn_1-yO ₃ (y = 0, 0.02, 0.06), the X-band electron magnetic resonance measurements were carried out in the temperature range 5 K ≤ T ≤ 600 K. The temperature dependences of doubly integrated intensity of electron paramagnetic resonance signal and its linewidth were fitted with known theoretical models modified for taking into account the different mechanisms of spin relaxation. The experimental data and their fits evidence that Mn- and La-site vacancies dope the holes in parent LaMnO₃, which induces ferromagnetic double exchange interaction. However, strong structural and chemical disorder of La_1-xMnO₃ crystals makes the ferromagnetic ground state eventually impossible even at x = 0.13. In a contrast, better structural/chemical homogeneity together with a stronger impact of Mn-site vacancies on mixed manganese valence and double exchange are characteristic for LaMn_1-yO₃ ceramics. As a result, the LaMnl_0.94O₃ compound appears to be ferromagnetic-like ordered and demonstrates band-like propagation of doped carriers.

Original language	English
Article number	5257272
Pages (from-to)	4348-4351
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	45
Issue number	10
DOIs	https://doi.org/10.1109/TMAG.2009.2024630
State	Published - 1 Jan 2009
Externally published	Yes

Keywords

Magnetic resonance
Magnetization processes
Manganese compounds

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2009.2024630

Cite this

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title = "Electron magnetic resonance study of magnetic order, paramagnetic magnetic correlations, and spin dynamics in La- and Mn-deficient LaMnO3 manganites",

abstract = "To probe magnetic ordering in single crystals of La1-x,MnO 3 (x=0.01,0.05,0.13) and in ceramics of LaMn1-yO 3 (y = 0, 0.02, 0.06), the X-band electron magnetic resonance measurements were carried out in the temperature range 5 K ≤ T ≤ 600 K. The temperature dependences of doubly integrated intensity of electron paramagnetic resonance signal and its linewidth were fitted with known theoretical models modified for taking into account the different mechanisms of spin relaxation. The experimental data and their fits evidence that Mn- and La-site vacancies dope the holes in parent LaMnO3, which induces ferromagnetic double exchange interaction. However, strong structural and chemical disorder of La1-xMnO3 crystals makes the ferromagnetic ground state eventually impossible even at x = 0.13. In a contrast, better structural/chemical homogeneity together with a stronger impact of Mn-site vacancies on mixed manganese valence and double exchange are characteristic for LaMn1-yO3 ceramics. As a result, the LaMnl0.94O3 compound appears to be ferromagnetic-like ordered and demonstrates band-like propagation of doped carriers.",

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

author = "Mark Auslender and Alexander Shames and Evgeny Rosenberg and Gad Gorodetsky and Mukovskii, {Ya M.}",

note = "Funding Information: ACKNOWLEDGMENT This work was supported in part by the ISF under Grant 845/05.",

year = "2009",

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doi = "10.1109/TMAG.2009.2024630",

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T1 - Electron magnetic resonance study of magnetic order, paramagnetic magnetic correlations, and spin dynamics in La- and Mn-deficient LaMnO3 manganites

AU - Auslender, Mark

AU - Shames, Alexander

AU - Rosenberg, Evgeny

AU - Gorodetsky, Gad

AU - Mukovskii, Ya M.

N1 - Funding Information: ACKNOWLEDGMENT This work was supported in part by the ISF under Grant 845/05.

PY - 2009/1/1

Y1 - 2009/1/1

N2 - To probe magnetic ordering in single crystals of La1-x,MnO 3 (x=0.01,0.05,0.13) and in ceramics of LaMn1-yO 3 (y = 0, 0.02, 0.06), the X-band electron magnetic resonance measurements were carried out in the temperature range 5 K ≤ T ≤ 600 K. The temperature dependences of doubly integrated intensity of electron paramagnetic resonance signal and its linewidth were fitted with known theoretical models modified for taking into account the different mechanisms of spin relaxation. The experimental data and their fits evidence that Mn- and La-site vacancies dope the holes in parent LaMnO3, which induces ferromagnetic double exchange interaction. However, strong structural and chemical disorder of La1-xMnO3 crystals makes the ferromagnetic ground state eventually impossible even at x = 0.13. In a contrast, better structural/chemical homogeneity together with a stronger impact of Mn-site vacancies on mixed manganese valence and double exchange are characteristic for LaMn1-yO3 ceramics. As a result, the LaMnl0.94O3 compound appears to be ferromagnetic-like ordered and demonstrates band-like propagation of doped carriers.

AB - To probe magnetic ordering in single crystals of La1-x,MnO 3 (x=0.01,0.05,0.13) and in ceramics of LaMn1-yO 3 (y = 0, 0.02, 0.06), the X-band electron magnetic resonance measurements were carried out in the temperature range 5 K ≤ T ≤ 600 K. The temperature dependences of doubly integrated intensity of electron paramagnetic resonance signal and its linewidth were fitted with known theoretical models modified for taking into account the different mechanisms of spin relaxation. The experimental data and their fits evidence that Mn- and La-site vacancies dope the holes in parent LaMnO3, which induces ferromagnetic double exchange interaction. However, strong structural and chemical disorder of La1-xMnO3 crystals makes the ferromagnetic ground state eventually impossible even at x = 0.13. In a contrast, better structural/chemical homogeneity together with a stronger impact of Mn-site vacancies on mixed manganese valence and double exchange are characteristic for LaMn1-yO3 ceramics. As a result, the LaMnl0.94O3 compound appears to be ferromagnetic-like ordered and demonstrates band-like propagation of doped carriers.

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