Reduced ferromagnetic transition temperatures in SrRu1-vO3 perovskites from Ru-site vacancies -: art. no. 014423

被引：85

作者：

Dabrowski, B ^{[1
]}

Chmaissem, O

Klamut, PW

Kolesnik, S

Maxwell, M

Mais, J

Ito, Y

Armstrong, BD

Jorgensen, JD

Short, S

机构：

[1] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[2] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW B | 2004年 / 70卷 / 01期

关键词：

D O I：

10.1103/PhysRevB.70.014423

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We show that annealing of stoichiometric SrRuO3 perovskites in high-pressure oxygen of 600 atm near 1100 degreesC produces SrRu1-vO3 compounds with vacancies on the Ru-sites. The creation of Ru vacancies rapidly suppresses the ferromagnetic ordering temperature, T-C, from 163 K to 45 K with an increase of vapproximate to0.09. Subtle structural changes that accompany the creation of Ru-site vacancies are different from the typical properties of transition metal perovskites, for which an increased formal oxidation state of the B-site cations normally leads to decreased B-O interatomic distances and contraction of the unit cell volume. The reduced charge screening caused by the Ru-vacancies offsets an expected decrease of the average interatomic distance Ru-O and rotation of the RuO6 octahedra as Sr atoms relax toward Ru-vacancies increases the observed volume.

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页码：014423 / 1

页数：7

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