Magnetotransport properties of ferromagnetic LaMnO3+δ nano-sized crystals

V. Markovich; G. Jung; I. Fita; D. Mogilyansky; X. Wu; A. Wisniewski; R. Puzniak; L. Titelman; L. Vradman; M. Herskowitz; G. Gorodetsky

doi:10.1016/j.jmmm.2009.04.012

Magnetotransport properties of ferromagnetic LaMnO_3+δ nano-sized crystals

V. Markovich, G. Jung, I. Fita, D. Mogilyansky, X. Wu, A. Wisniewski, R. Puzniak, L. Titelman, L. Vradman, M. Herskowitz, G. Gorodetsky

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

15 Scopus citations

Abstract

Transport and magnetic properties of LaMnO_3+δ nanoparticles with average size of 18 nm have been investigated. The ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at T_C∼246 K, while the spontaneous magnetization disappears at T≈270 K. It was found that the blocking temperature lies slightly below T_C. The temperature dependence of the resistivity shows a metal-insulator transition at T≈192 K and low-temperature upturn at T<50 K. The transport at low temperatures is controlled by the charging energy and spin-dependent tunnelling through grain boundaries. The low temperature I-V characteristics are well described by indirect tunnelling model while at higher temperatures both direct and resonant tunnelling dominates.

Original language	English
Pages (from-to)	1311-1314
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	322
Issue number	9-12
DOIs	https://doi.org/10.1016/j.jmmm.2009.04.012
State	Published - 1 May 2010

Keywords

Curie temperature
Magnetization
Manganite
Nanoparticle
Resistivity
Tunnelling

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2009.04.012

Cite this

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title = "Magnetotransport properties of ferromagnetic LaMnO3+δ nano-sized crystals",

abstract = "Transport and magnetic properties of LaMnO3+δ nanoparticles with average size of 18 nm have been investigated. The ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at TC∼246 K, while the spontaneous magnetization disappears at T≈270 K. It was found that the blocking temperature lies slightly below TC. The temperature dependence of the resistivity shows a metal-insulator transition at T≈192 K and low-temperature upturn at T<50 K. The transport at low temperatures is controlled by the charging energy and spin-dependent tunnelling through grain boundaries. The low temperature I-V characteristics are well described by indirect tunnelling model while at higher temperatures both direct and resonant tunnelling dominates.",

keywords = "Curie temperature, Magnetization, Manganite, Nanoparticle, Resistivity, Tunnelling",

author = "V. Markovich and G. Jung and I. Fita and D. Mogilyansky and X. Wu and A. Wisniewski and R. Puzniak and L. Titelman and L. Vradman and M. Herskowitz and G. Gorodetsky",

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T1 - Magnetotransport properties of ferromagnetic LaMnO3+δ nano-sized crystals

AU - Markovich, V.

AU - Jung, G.

AU - Fita, I.

AU - Mogilyansky, D.

AU - Wu, X.

AU - Wisniewski, A.

AU - Puzniak, R.

AU - Titelman, L.

AU - Vradman, L.

AU - Herskowitz, M.

AU - Gorodetsky, G.

PY - 2010/5/1

Y1 - 2010/5/1

N2 - Transport and magnetic properties of LaMnO3+δ nanoparticles with average size of 18 nm have been investigated. The ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at TC∼246 K, while the spontaneous magnetization disappears at T≈270 K. It was found that the blocking temperature lies slightly below TC. The temperature dependence of the resistivity shows a metal-insulator transition at T≈192 K and low-temperature upturn at T<50 K. The transport at low temperatures is controlled by the charging energy and spin-dependent tunnelling through grain boundaries. The low temperature I-V characteristics are well described by indirect tunnelling model while at higher temperatures both direct and resonant tunnelling dominates.

AB - Transport and magnetic properties of LaMnO3+δ nanoparticles with average size of 18 nm have been investigated. The ensemble of nanoparticles exhibits a paramagnetic to ferromagnetic (FM) transition at TC∼246 K, while the spontaneous magnetization disappears at T≈270 K. It was found that the blocking temperature lies slightly below TC. The temperature dependence of the resistivity shows a metal-insulator transition at T≈192 K and low-temperature upturn at T<50 K. The transport at low temperatures is controlled by the charging energy and spin-dependent tunnelling through grain boundaries. The low temperature I-V characteristics are well described by indirect tunnelling model while at higher temperatures both direct and resonant tunnelling dominates.

KW - Curie temperature

KW - Magnetization

KW - Manganite

KW - Nanoparticle

KW - Resistivity

KW - Tunnelling

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