Effects of magnetization on hole localization and MnO6 octahedra disorder in hole-doped lanthanum manganese perovskites

C. H. Booth; F. Bridges; J. J. Neumeier; E. L. Brosha; T. H. Geballe; G. J. Snyder; G. H. Kwei

Effects of magnetization on hole localization and MnO₆ octahedra disorder in hole-doped lanthanum manganese perovskites

C. H. Booth^*, F. Bridges, J. J. Neumeier, E. L. Brosha, T. H. Geballe, G. J. Snyder, G. H. Kwei

^*Corresponding author for this work

Materials Science and Engineering

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

1 Scopus citations

Abstract

We review the distortions of the MnO₆ octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems we consider include the "colossal" magnetoresistance (CMR) samples La_{1 - x}Ca_xMnO₃ (x=0.21, 0.25, 0.30), La_0.67Ba_0.33MnO₃, and a poorer quality La_0.67Pb_0.33MnO₃ sample. We also report preliminary work on three samples of oxygen-doped LaMnO_{3 + δ} and a lanthanum-deficient La_0.9MnO₃ sample. We find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca-doped samples. The MnO₆ distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above T_c, the antiferromagnetic LaMnO_3.006 sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near T_N, possibly due to FM coupling within MnO planes.

Original language	English (US)
Pages (from-to)	295-298
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	12
Issue number	1
State	Published - 1999

Keywords

"colossal" magnetoresistance (CMR)
Jahn-teller polarons
LaAMno; laMno
X-ray-absorption fine-structure (XAFS)

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Cite this

@article{90d54384809a4b9fb4362953f68673a9,

title = "Effects of magnetization on hole localization and MnO6 octahedra disorder in hole-doped lanthanum manganese perovskites",

abstract = "We review the distortions of the MnO6 octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems we consider include the {"}colossal{"} magnetoresistance (CMR) samples La1 - xCaxMnO3 (x=0.21, 0.25, 0.30), La0.67Ba0.33MnO3, and a poorer quality La0.67Pb0.33MnO3 sample. We also report preliminary work on three samples of oxygen-doped LaMnO3 + δ and a lanthanum-deficient La0.9MnO3 sample. We find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca-doped samples. The MnO6 distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above Tc, the antiferromagnetic LaMnO3.006 sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near TN, possibly due to FM coupling within MnO planes.",

keywords = "{"}colossal{"} magnetoresistance (CMR), Jahn-teller polarons, LaAMno; laMno, X-ray-absorption fine-structure (XAFS)",

author = "Booth, {C. H.} and F. Bridges and Neumeier, {J. J.} and Brosha, {E. L.} and Geballe, {T. H.} and Snyder, {G. J.} and Kwei, {G. H.}",

note = "Funding Information: Work at Los Alamos National Laboratory (LANL) was performed under the auspices of the U.S. Department of Energy (DOE). Experiments were performed at the Stanford Synchrotron Radiation Laboratory, which is operated by the DOE, Division of Chemical Sciences, and by the NIH, Biomedical Resource Technology Program, Division of Research Resources.",

year = "1999",

language = "English (US)",

volume = "12",

pages = "295--298",

journal = "Journal of Superconductivity and Novel Magnetism",

issn = "1557-1939",

publisher = "Springer New York",

number = "1",

}

TY - JOUR

T1 - Effects of magnetization on hole localization and MnO6 octahedra disorder in hole-doped lanthanum manganese perovskites

AU - Booth, C. H.

AU - Bridges, F.

AU - Neumeier, J. J.

AU - Brosha, E. L.

AU - Geballe, T. H.

AU - Snyder, G. J.

AU - Kwei, G. H.

N1 - Funding Information: Work at Los Alamos National Laboratory (LANL) was performed under the auspices of the U.S. Department of Energy (DOE). Experiments were performed at the Stanford Synchrotron Radiation Laboratory, which is operated by the DOE, Division of Chemical Sciences, and by the NIH, Biomedical Resource Technology Program, Division of Research Resources.

PY - 1999

Y1 - 1999

N2 - We review the distortions of the MnO6 octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems we consider include the "colossal" magnetoresistance (CMR) samples La1 - xCaxMnO3 (x=0.21, 0.25, 0.30), La0.67Ba0.33MnO3, and a poorer quality La0.67Pb0.33MnO3 sample. We also report preliminary work on three samples of oxygen-doped LaMnO3 + δ and a lanthanum-deficient La0.9MnO3 sample. We find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca-doped samples. The MnO6 distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above Tc, the antiferromagnetic LaMnO3.006 sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near TN, possibly due to FM coupling within MnO planes.

AB - We review the distortions of the MnO6 octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems we consider include the "colossal" magnetoresistance (CMR) samples La1 - xCaxMnO3 (x=0.21, 0.25, 0.30), La0.67Ba0.33MnO3, and a poorer quality La0.67Pb0.33MnO3 sample. We also report preliminary work on three samples of oxygen-doped LaMnO3 + δ and a lanthanum-deficient La0.9MnO3 sample. We find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca-doped samples. The MnO6 distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above Tc, the antiferromagnetic LaMnO3.006 sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near TN, possibly due to FM coupling within MnO planes.

KW - "colossal" magnetoresistance (CMR)

KW - Jahn-teller polarons

KW - LaAMno; laMno

KW - X-ray-absorption fine-structure (XAFS)

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AN - SCOPUS:0033076537

VL - 12

SP - 295

EP - 298

JO - Journal of Superconductivity and Novel Magnetism

JF - Journal of Superconductivity and Novel Magnetism

SN - 1557-1939

IS - 1

ER -

Effects of magnetization on hole localization and MnO₆ octahedra disorder in hole-doped lanthanum manganese perovskites

Abstract

Keywords

ASJC Scopus subject areas

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