Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides

H. L. Ju; Hyunchul Sohn

doi:10.1016/S0304-8853(96)00647-6

Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides

H. L. Ju, Hyunchul Sohn

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136 Citations (Scopus)

Abstract

The magnetic and magnetotransport properties of the manganites, R_1-xA_xMnO_z (R = La, Pr, Nd; A = Ca, Sr, Ba), are strongly dependent on the doping level x and the oxygen stoichiometry z. For x ≥ ∼ 0.2, stoichiometric R_1-xA_xMnO₃ was found to have a small temperature independent coercivity of 5-30 Oe and the saturation magnetization (∼ 90 emu/g) of fully aligned Mn ions. Oxygen deficient (or x < 0.2) R_1-xA_xMnO_z has a saturation magnetization smaller than that of fully aligned Mn spins and shows an enhancement and temperature dependence of the coercivity, and spin freezing behavior. The latter is characterized by a peak in zero field cooled (ZFC) magnetization. Our data suggest that oxygen deficient or low doped manganites are magnetically inhomogeneous. We discuss possible origins of the magnetic inhomogeneity and its influence on the colossal magnetoresistance.

Original language	English
Pages (from-to)	200-208
Number of pages	9
Journal	Journal of Magnetism and Magnetic Materials
Volume	167
Issue number	3
DOIs	https://doi.org/10.1016/S0304-8853(96)00647-6
Publication status	Published - 1997 Mar

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/S0304-8853(96)00647-6

Cite this

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title = "Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides",

abstract = "The magnetic and magnetotransport properties of the manganites, R1-xAxMnOz (R = La, Pr, Nd; A = Ca, Sr, Ba), are strongly dependent on the doping level x and the oxygen stoichiometry z. For x ≥ ∼ 0.2, stoichiometric R1-xAxMnO3 was found to have a small temperature independent coercivity of 5-30 Oe and the saturation magnetization (∼ 90 emu/g) of fully aligned Mn ions. Oxygen deficient (or x < 0.2) R1-xAxMnOz has a saturation magnetization smaller than that of fully aligned Mn spins and shows an enhancement and temperature dependence of the coercivity, and spin freezing behavior. The latter is characterized by a peak in zero field cooled (ZFC) magnetization. Our data suggest that oxygen deficient or low doped manganites are magnetically inhomogeneous. We discuss possible origins of the magnetic inhomogeneity and its influence on the colossal magnetoresistance.",

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T1 - Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides

AU - Ju, H. L.

AU - Sohn, Hyunchul

PY - 1997/3

Y1 - 1997/3

N2 - The magnetic and magnetotransport properties of the manganites, R1-xAxMnOz (R = La, Pr, Nd; A = Ca, Sr, Ba), are strongly dependent on the doping level x and the oxygen stoichiometry z. For x ≥ ∼ 0.2, stoichiometric R1-xAxMnO3 was found to have a small temperature independent coercivity of 5-30 Oe and the saturation magnetization (∼ 90 emu/g) of fully aligned Mn ions. Oxygen deficient (or x < 0.2) R1-xAxMnOz has a saturation magnetization smaller than that of fully aligned Mn spins and shows an enhancement and temperature dependence of the coercivity, and spin freezing behavior. The latter is characterized by a peak in zero field cooled (ZFC) magnetization. Our data suggest that oxygen deficient or low doped manganites are magnetically inhomogeneous. We discuss possible origins of the magnetic inhomogeneity and its influence on the colossal magnetoresistance.

AB - The magnetic and magnetotransport properties of the manganites, R1-xAxMnOz (R = La, Pr, Nd; A = Ca, Sr, Ba), are strongly dependent on the doping level x and the oxygen stoichiometry z. For x ≥ ∼ 0.2, stoichiometric R1-xAxMnO3 was found to have a small temperature independent coercivity of 5-30 Oe and the saturation magnetization (∼ 90 emu/g) of fully aligned Mn ions. Oxygen deficient (or x < 0.2) R1-xAxMnOz has a saturation magnetization smaller than that of fully aligned Mn spins and shows an enhancement and temperature dependence of the coercivity, and spin freezing behavior. The latter is characterized by a peak in zero field cooled (ZFC) magnetization. Our data suggest that oxygen deficient or low doped manganites are magnetically inhomogeneous. We discuss possible origins of the magnetic inhomogeneity and its influence on the colossal magnetoresistance.

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Magnetic inhomogeneity and colossal magnetoresistance in manganese oxides

Abstract

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