title: Soft ferromagnetism in mixed valence Sr(1-x)La(x)Ti(0.5)Mn(0.5)O₃ perovskites.
abstract: The structural, magnetic and electrical properties of the mixed Ti-Mn oxides Sr(1-x)La(x)Ti(0.5)Mn(0.5)O3 (0 ≤ x ≤ 0.5) are reported. At room temperature the oxides have a cubic structure in space group Pm3m for x ≤ 0.25 and rhombohedral in R3c for 0.3 ≤ x ≤ 0.50. X-ray absorption spectroscopic measurements demonstrate the addition of La(3+) is compensated by the partial reduction of Mn(4+) to Mn(3+). Variable temperature neutron diffraction measurements show that cooling Sr(0.6)La(0.4)Ti(0.5)Mn(0.5)O3 results in a first order transition from rhombohedra to an orthorhombic structure in Imma. Complex magnetic behaviour is observed. The magnetic behaviour of the mixed valent (Mn(3+/4+)) examples is dominated by ferromagnetic interactions, although cation disorder frustrates long range magnetic ordering.
authors.affiliation: School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia. B.Kennedy@chem.usyd.edu.au.
authors.forename: Ilyas
authors.initials: I
authors.lastname: Qasim
authors.forename: Peter E R
authors.initials: PE
authors.lastname: Blanchard
authors.forename: Brendan J
authors.initials: BJ
authors.lastname: Kennedy
authors.forename: Chris D
authors.initials: CD
authors.lastname: Ling
authors.forename: Ling-Yun
authors.initials: LY
authors.lastname: Jang
authors.forename: Takashi
authors.initials: T
authors.lastname: Kamiyama
authors.forename: Ping
authors.initials: P
authors.lastname: Miao
authors.forename: Shuki
authors.initials: S
authors.lastname: Torii