Layered manganites: Magnetic structure at extreme doping levels

Citation
Jf. Mitchell et al., Layered manganites: Magnetic structure at extreme doping levels, J APPL PHYS, 85(8), 1999, pp. 4352-4354
Citations number
29
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
JOURNAL OF APPLIED PHYSICS
ISSN journal
00218979 → ACNP
Volume
85
Issue
8
Year of publication
1999
Part
2A
Pages
4352 - 4354
Database
ISI
SICI code
0021-8979(19990415)85:8<4352:LMMSAE>2.0.ZU;2-A
Abstract
We report powder neutron diffraction results on the crystal and magnetic st ructures of the bilayer Ruddlesden-Popper phase Sr3Mn2O7-delta(delta = 0.0, 0.45) and correlate these structures with their magnetic and transport pro perties. The delta = 0.45 compound contains a large number of oxygen vacanc ies 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 t o its doped congeners in the La2-2xSr1+2xMn2O7 series highlights the extrem e sensitivity of magnetic structure to dopant concentration in these layere d materials. (C) 1999 American Institute of Physics. [S0021-8979(99)18608-0 ].