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Physical Properties of Oxygen Composition Controlled La1-xSrxMnOy Single Crystals

Published online by Cambridge University Press:  26 February 2011

Yuui Yokota ,
Jun-ichi Shimoyama ,
Tetsuro Ogata ,
Shigeru Horii  and
Kohji Kishio
Yuui Yokota
Affiliation:
tt57141@mail.ecc.u-tokyo.ac.jp, University of Tokyo, Applied Chemistry, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Jun-ichi Shimoyama
Affiliation:
shimo@sogo.t.u-tokyo.ac.jp, University of Tokyo, Applied Chemistry, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Tetsuro Ogata
Affiliation:
tt66688@mail.ecc.u-tokyo.ac.jp, University of Tokyo, Applied Chemistry, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Shigeru Horii
Affiliation:
tholy@mail.ecc.u-tokyo.ac.jp, University of Tokyo, Applied Chemistry, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
Kohji Kishio
Affiliation:
tkishio@mail.ecc.u-tokyo.ac.jp, University of Tokyo, Applied Chemistry, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan
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Abstract

We have investigated the effect of high-temperature post-annealing and control of excess oxygen for La1-xSrxMnOy (0.05 ≤ x ≤ 0.2) single crystals. Thin plate-like single crystals prepared by careful cutting and polishing enabled the control of excess oxygen for the single crystals by post-annealing for relatively short times at various temperatures. Post-annealed crystals with y ∼ 3.00 exhibited higher TC than that of as-grown crystals due to homogenization of cation and oxygen compositions and reduction of local lattice strains. With an increase of y, TC systematically increased for all Sr compositions. Competition between an increase of mean valence of manganese and generation of cation vacancy determines the TC of La1-xSrxMnOy crystals.

Keywords

magnetoresistance (magnetic)Mnferromagnetic
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 988: Symposium QQ – Solid-State Chemistry of Inorganic Materials VI , 2006 , 0988-QQ09-12
Copyright
Copyright © Materials Research Society 2007

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References

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