Sr3Mn2O7: Mn4+Parent Compound of then=2 Layered CMR Manganites

✍ Scribed by J.F. Mitchell; J.E. Millburn; M. Medarde; S. Short; J.D. Jorgensen; M.T. Fernández-Dı́az

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 367 KB
• Volume: 141
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8026

✦ Synopsis

We report the crystal and magnetic structures of the bilayer Ruddlesden-Popper phase Sr 3 Mn 2 O 7؊ ( ‫؍‬ 0.0, 0.45). The ‫؍‬ 0.45 compound exhibits a large number of oxygen vacancies disordered in the MnO 2 planes and is a nonmagnetic insulator. Sr 3 Mn 2 O 7.0 ( ‫؍‬ 0) in an antiferromagnetic insulator whose magnetic structure is analogous to that of the related SrMnO 3 perovskite. The stoichiometric layered material has a small distortion of its exclusively Mn 4 ؉ O 6 octahedra as a result of steric influence of the surrounding cations. Thus, it provides a baseline for structural distortions related to electronic and/or magnetic transitions in doped materials.