Magnetic signature of symmetry reduction in epitaxial La{sub 0.67}Sr{sub 0.33}MnO{sub 3} films

Journal Article · Mon Aug 08 00:00:00 EDT 2011 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3623442· OSTI ID:22027706

Barua, Radhika; Lewis, L H ^[1]; Heiman, D ^[2]

---

1. Department of Chemical Engineering, Northeastern University, Boston, Massachusetts 02115 (United States)
2. Department of Physics, Northeastern University, Boston, Massachusetts 02115 (United States)

The magnetic properties of epitaxially grown La{sub 0.67}Sr{sub 0.33}MnO{sub 3} perovskite thin films were investigated to elucidate an unexpected broken symmetry between orthogonal [100] and [010] inplane directions, resulting from the magnetostructural coupling between the film and the cubic SrTiO{sub 3} (001) substrate. The films were synthesized by molecular beam epitaxy with either complete or zero A-site cation disorder. Magnetization measured in [100] and [010] directions shows differences that signal a reduction of the in-plane cubic symmetry only for T < 290 K. The magnetization asymmetry is more robust in the film with complete A-site disorder. These results are attributed to a dominant Mn{sup 3+} character at the film-substrate interface and an associated out-of-plane bonding character with hypothesized origins in both charge imbalance and strain effects.

• OSTI ID: 22027706
• Journal Information: Applied Physics Letters, Vol. 99, Issue 6; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
ASYMMETRY
CATIONS
COUPLING
CRYSTAL GROWTH
CRYSTAL STRUCTURE
INTERFACES
LANTHANUM COMPOUNDS
LAYERS
MAGNETIC PROPERTIES
MAGNETIZATION
MANGANATES
MANGANESE IONS
MOLECULAR BEAM EPITAXY
PEROVSKITE
STRAINS
STRONTIUM TITANATES
SUBSTRATES
SYMMETRY BREAKING
THIN FILMS