Dramatic change in magnetization behaviors of la1.4Sr 1.6Mn2O7+δ by control of excess oxygen

Yuui Yokota; Jun Ichi Shimoyama; Shigeru Horii; Kohji Kishio

doi:10.1143/JJAP.45.L204

Dramatic change in magnetization behaviors of la_1.4Sr _1.6Mn₂O_7+δ by control of excess oxygen

Yuui Yokota, Jun Ichi Shimoyama, Shigeru Horii, Kohji Kishio

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

Abstract

Effects of excess oxygen on the magnetic properties and crystal structure of La_1.4Sr_1.6Mn₂O_y, single crystals have been systematically investigated. The magnetic easy axis of the crystal annealed at 700°C in flowing oxygen for long time was discovered to change from the c-axis to the ab-plane below ferromagnetic transition temperature (T_C) by introduction of excess oxygen. Powder X-ray diffraction (XRD) analyses revealed that the c-axis length decreased and the a-axis length increased with increase of the excess oxygen. These behaviors are similar to that of increasing of strontium substitution level in the L _2-2xSr_1-2xMn₂O₇ [(La,Sr)Mn327] system. T_C was increased up to ∼130K by the introduction of excess oxygen, however the transition was broad. These suggested that the excess oxygen can play an important role for determining magnetic properties of the (La,Sr)Mn327.

Original language	English
Pages (from-to)	L204-L206
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	45
Issue number	4-7
DOIs	https://doi.org/10.1143/JJAP.45.L204
Publication status	Published - 2006 Feb 3
Externally published	Yes

Keywords

Excess oxygen
Jahn-Teller distortion
LaSrMnO
Magnetic easy axis
Mean valence of manganese
Oxygen content
Oxygen nonstoichiometry

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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title = "Dramatic change in magnetization behaviors of la1.4Sr 1.6Mn2O7+δ by control of excess oxygen",

abstract = "Effects of excess oxygen on the magnetic properties and crystal structure of La1.4Sr1.6Mn2Oy, single crystals have been systematically investigated. The magnetic easy axis of the crystal annealed at 700°C in flowing oxygen for long time was discovered to change from the c-axis to the ab-plane below ferromagnetic transition temperature (TC) by introduction of excess oxygen. Powder X-ray diffraction (XRD) analyses revealed that the c-axis length decreased and the a-axis length increased with increase of the excess oxygen. These behaviors are similar to that of increasing of strontium substitution level in the L 2-2xSr1-2xMn2O7 [(La,Sr)Mn327] system. TC was increased up to ∼130K by the introduction of excess oxygen, however the transition was broad. These suggested that the excess oxygen can play an important role for determining magnetic properties of the (La,Sr)Mn327.",

keywords = "Excess oxygen, Jahn-Teller distortion, LaSrMnO, Magnetic easy axis, Mean valence of manganese, Oxygen content, Oxygen nonstoichiometry",

author = "Yuui Yokota and Shimoyama, {Jun Ichi} and Shigeru Horii and Kohji Kishio",

year = "2006",

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doi = "10.1143/JJAP.45.L204",

language = "English",

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T1 - Dramatic change in magnetization behaviors of la1.4Sr 1.6Mn2O7+δ by control of excess oxygen

AU - Yokota, Yuui

AU - Shimoyama, Jun Ichi

AU - Horii, Shigeru

AU - Kishio, Kohji

PY - 2006/2/3

Y1 - 2006/2/3

N2 - Effects of excess oxygen on the magnetic properties and crystal structure of La1.4Sr1.6Mn2Oy, single crystals have been systematically investigated. The magnetic easy axis of the crystal annealed at 700°C in flowing oxygen for long time was discovered to change from the c-axis to the ab-plane below ferromagnetic transition temperature (TC) by introduction of excess oxygen. Powder X-ray diffraction (XRD) analyses revealed that the c-axis length decreased and the a-axis length increased with increase of the excess oxygen. These behaviors are similar to that of increasing of strontium substitution level in the L 2-2xSr1-2xMn2O7 [(La,Sr)Mn327] system. TC was increased up to ∼130K by the introduction of excess oxygen, however the transition was broad. These suggested that the excess oxygen can play an important role for determining magnetic properties of the (La,Sr)Mn327.

AB - Effects of excess oxygen on the magnetic properties and crystal structure of La1.4Sr1.6Mn2Oy, single crystals have been systematically investigated. The magnetic easy axis of the crystal annealed at 700°C in flowing oxygen for long time was discovered to change from the c-axis to the ab-plane below ferromagnetic transition temperature (TC) by introduction of excess oxygen. Powder X-ray diffraction (XRD) analyses revealed that the c-axis length decreased and the a-axis length increased with increase of the excess oxygen. These behaviors are similar to that of increasing of strontium substitution level in the L 2-2xSr1-2xMn2O7 [(La,Sr)Mn327] system. TC was increased up to ∼130K by the introduction of excess oxygen, however the transition was broad. These suggested that the excess oxygen can play an important role for determining magnetic properties of the (La,Sr)Mn327.

KW - Excess oxygen

KW - Jahn-Teller distortion

KW - LaSrMnO

KW - Magnetic easy axis

KW - Mean valence of manganese

KW - Oxygen content

KW - Oxygen nonstoichiometry

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