Magnetic Susceptibility and Spin Exchange Interactions of the Hexagonal Perovskite-Type Oxides Sr4/3(Mn2/3Ni1/3)O3

✍ Scribed by A El Abed; E Gaudin; J Darriet; M.-H Whangbo

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 209 KB
• Volume: 163
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9439

✦ Synopsis

Magnetic susceptibility measurements were carried out for two hexagonal perovskite-type oxides Sr 1؉x (Mn 1؊x Ni x )O 3 with slightly di4erent compositions (i.e., x ‫؍‬ 1 3 and 0.324). A signi5cant di4erence in the susceptibilities of the two phases demonstrates the need to control phase compositions accurately. Sr 4/3 (Mn 2/3 Ni 1/3 )O 3 consists of two spin sublattices, i.e., the Mn 4؉ and the Ni 2؉ ion sublattices. Spin dimer analysis was carried out to examine the relative strengths in the spin exchange interactions of the Mn 4؉ ion sublattice. The temperature dependence of the magnetic susceptibility of Sr 4/3 (Mn 2/3 Ni 1/3 )O 3 was found consistent with a picture in which the Mn 4؉ ion sublattice has weakly interacting antiferromagnetically coupled (Mn 4؉ ) 2 dimers, the Ni 2؉ ion sublattice acts as a paramagnetic system, and the two sublattices are nearly independent.

2002 Elsevier Science (USA)