Contrasting magnetic and structural properties of two La manganites with the same doping levels

T. R. McGuire; P. R. Duncombe; G. Q. Gong; A. Gupta; X. W. Li; S. J. Pickart; M. L. Crow

doi:10.1063/1.367571

Contrasting magnetic and structural properties of two La manganites with the same doping levels

T. R. McGuire, P. R. Duncombe, G. Q. Gong, A. Gupta, X. W. Li, S. J. Pickart, M. L. Crow

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

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Abstract

Powder and sintered samples of La_0.9MnO₃ (LMO) and La_0.62Y_0.07Ca_0.31MnO₃ (LYCMO) are used in this study. The two initial calcined in air powders have almost identical ferromagnetic properties with T_c≈250K, and saturation magnetization of σ≈90 emu/gm corresponding to Mn⁴⁺(0.3)/ Mn³⁺(0.7). Heating the calcined powders in argon to high temperatures lowers T_c to ≈120 K; however, subsequent oxygen annealing brings back the high T_c form. The LYCMO remains ferromagnetic with σ≈90 emu/gm in both heat treatments but only has a colossal magnetoresistance (MR) for T_c≈120 K. In contrast the LMO with T_c≈120 K has σ reduced to one-half its ferromagnetic value and the MR is almost zero. Neutron diffraction shows only the ferromagnetic structure below T_c for LYCMO but the low magnetization of LMO is best interpreted as a mixed ferro-antiferromagnetic structure rather than a canted one.

Original language	English
Pages (from-to)	7076-7078
Number of pages	3
Journal	Journal of Applied Physics
Volume	83
Issue number	11
DOIs	https://doi.org/10.1063/1.367571
State	Published - 1998
Externally published	Yes

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title = "Contrasting magnetic and structural properties of two La manganites with the same doping levels",

abstract = "Powder and sintered samples of La0.9MnO3 (LMO) and La0.62Y0.07Ca0.31MnO3 (LYCMO) are used in this study. The two initial calcined in air powders have almost identical ferromagnetic properties with Tc≈250K, and saturation magnetization of σ≈90 emu/gm corresponding to Mn4+(0.3)/ Mn3+(0.7). Heating the calcined powders in argon to high temperatures lowers Tc to ≈120 K; however, subsequent oxygen annealing brings back the high Tc form. The LYCMO remains ferromagnetic with σ≈90 emu/gm in both heat treatments but only has a colossal magnetoresistance (MR) for Tc≈120 K. In contrast the LMO with Tc≈120 K has σ reduced to one-half its ferromagnetic value and the MR is almost zero. Neutron diffraction shows only the ferromagnetic structure below Tc for LYCMO but the low magnetization of LMO is best interpreted as a mixed ferro-antiferromagnetic structure rather than a canted one.",

author = "McGuire, {T. R.} and Duncombe, {P. R.} and Gong, {G. Q.} and A. Gupta and Li, {X. W.} and Pickart, {S. J.} and Crow, {M. L.}",

year = "1998",

doi = "10.1063/1.367571",

language = "English",

volume = "83",

pages = "7076--7078",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Contrasting magnetic and structural properties of two La manganites with the same doping levels

AU - McGuire, T. R.

AU - Duncombe, P. R.

AU - Gong, G. Q.

AU - Gupta, A.

AU - Li, X. W.

AU - Pickart, S. J.

AU - Crow, M. L.

PY - 1998

Y1 - 1998

N2 - Powder and sintered samples of La0.9MnO3 (LMO) and La0.62Y0.07Ca0.31MnO3 (LYCMO) are used in this study. The two initial calcined in air powders have almost identical ferromagnetic properties with Tc≈250K, and saturation magnetization of σ≈90 emu/gm corresponding to Mn4+(0.3)/ Mn3+(0.7). Heating the calcined powders in argon to high temperatures lowers Tc to ≈120 K; however, subsequent oxygen annealing brings back the high Tc form. The LYCMO remains ferromagnetic with σ≈90 emu/gm in both heat treatments but only has a colossal magnetoresistance (MR) for Tc≈120 K. In contrast the LMO with Tc≈120 K has σ reduced to one-half its ferromagnetic value and the MR is almost zero. Neutron diffraction shows only the ferromagnetic structure below Tc for LYCMO but the low magnetization of LMO is best interpreted as a mixed ferro-antiferromagnetic structure rather than a canted one.

AB - Powder and sintered samples of La0.9MnO3 (LMO) and La0.62Y0.07Ca0.31MnO3 (LYCMO) are used in this study. The two initial calcined in air powders have almost identical ferromagnetic properties with Tc≈250K, and saturation magnetization of σ≈90 emu/gm corresponding to Mn4+(0.3)/ Mn3+(0.7). Heating the calcined powders in argon to high temperatures lowers Tc to ≈120 K; however, subsequent oxygen annealing brings back the high Tc form. The LYCMO remains ferromagnetic with σ≈90 emu/gm in both heat treatments but only has a colossal magnetoresistance (MR) for Tc≈120 K. In contrast the LMO with Tc≈120 K has σ reduced to one-half its ferromagnetic value and the MR is almost zero. Neutron diffraction shows only the ferromagnetic structure below Tc for LYCMO but the low magnetization of LMO is best interpreted as a mixed ferro-antiferromagnetic structure rather than a canted one.

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DO - 10.1063/1.367571

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SN - 0021-8979

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SP - 7076

EP - 7078

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 11

ER -

Contrasting magnetic and structural properties of two La manganites with the same doping levels

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