Dramatic effects of excess oxygen on physical properties and crystal structure of La0.95Sr0.05MnOy single crystal

Yuui Yokota; Jun ichi Shimoyama; Tetsuro Ogata; Shigeru Horii; Kohji Kishio

doi:10.1016/j.ssc.2007.03.038

Dramatic effects of excess oxygen on physical properties and crystal structure of La_0.95Sr_0.05MnO_y single crystal

Yuui Yokota, Jun ichi Shimoyama, Tetsuro Ogata, Shigeru Horii, Kohji Kishio

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

4 Citations (Scopus)

Abstract

We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La_0.95Sr_0.05MnO_y. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, T_C, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the T_C of crystals with excess oxygen was lower than that of the La_1-xSr_xMnO_3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.

Original language	English
Pages (from-to)	429-433
Number of pages	5
Journal	Solid State Communications
Volume	142
Issue number	8
DOIs	https://doi.org/10.1016/j.ssc.2007.03.038
Publication status	Published - 2007 May 1
Externally published	Yes

Keywords

A. Magnetically ordered materials
B. Crystal growth
C. Crystal structure and symmetry
D. Electronic transport

ASJC Scopus subject areas

Chemistry(all)
Condensed Matter Physics
Materials Chemistry

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title = "Dramatic effects of excess oxygen on physical properties and crystal structure of La0.95Sr0.05MnOy single crystal",

abstract = "We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La0.95Sr0.05MnOy. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, TC, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the TC of crystals with excess oxygen was lower than that of the La1-xSrxMnO3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.",

keywords = "A. Magnetically ordered materials, B. Crystal growth, C. Crystal structure and symmetry, D. Electronic transport",

author = "Yuui Yokota and Shimoyama, {Jun ichi} and Tetsuro Ogata and Shigeru Horii and Kohji Kishio",

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T1 - Dramatic effects of excess oxygen on physical properties and crystal structure of La0.95Sr0.05MnOy single crystal

AU - Yokota, Yuui

AU - Shimoyama, Jun ichi

AU - Ogata, Tetsuro

AU - Horii, Shigeru

AU - Kishio, Kohji

PY - 2007/5/1

Y1 - 2007/5/1

N2 - We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La0.95Sr0.05MnOy. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, TC, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the TC of crystals with excess oxygen was lower than that of the La1-xSrxMnO3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.

AB - We have examined the effects of excess oxygen on the magnetization, electrical transport properties and crystal structure of La0.95Sr0.05MnOy. An antiferromagnetic insulator phase confirmed in the as-grown crystal at low temperatures changed to a ferromagnetic insulator phase after the introduction of excess oxygen. The ferromagnetic transition temperature, TC, systematically increased with increasing oxygen content, y, due to an increase in the mean valence of manganese. However, the TC of crystals with excess oxygen was lower than that of the La1-xSrxMnO3.00 having identical manganese valence. This is considered to be a result of the competition among the mean valence of manganese, the concentration of cation vacancies, and the mean ionic radius of cations at the A-site.

KW - A. Magnetically ordered materials

KW - B. Crystal growth

KW - C. Crystal structure and symmetry

KW - D. Electronic transport

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