Layered manganites: Magnetic structure at extreme doping levels

被引：30

作者：

Mitchell, JF ^{[1
]}

Millburn, JE ^{[1
]}

Medarde, M ^{[1
]}

Argyriou, DN ^{[1
]}

Jorgensen, JD ^{[1
]}

机构：

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

来源：

JOURNAL OF APPLIED PHYSICS | 1999年 / 85卷 / 08期

关键词：

D O I：

10.1063/1.370498

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report powder neutron diffraction results on the crystal and magnetic structures of the bilayer Ruddlesden-Popper phase Sr3Mn2O7-delta(delta = 0.0, 0.45) and correlate these structures with their magnetic and transport properties. The delta = 0.45 compound contains a large number of oxygen vacancies that are disordered in the MnO2 planes. As a result of this disordered vacancy structure, Sr3Mn2O6.55 is a nonmagnetic insulator. Sr3Mn2O7.0(delta = 0) is an antiferromagnetic insulator whose magnetic structure is related to that of the SrMnO3 perovskite. Comparison of this end-member compound to its doped congeners in the La2-2xSr1+2xMn2O7 series highlights the extreme sensitivity of magnetic structure to dopant concentration in these layered materials. (C) 1999 American Institute of Physics. [S0021-8979(99)18608-0].

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页码：4352 / 4354

页数：3

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