Strain-Induced Change in Local Structure and its Effect on the Ferromagnetic Properties of La0.5Sr0.5CoO3 Thin Films

Journal Article · Tue Jan 01 00:00:00 EST 2008 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.3011031· OSTI ID:980476

Xie, C; Budnick, J; Hines, W; Wells, B; Woicik, J

We have used high-resolution extended x-ray absorption fine-structure and diffraction techniques to measure the local structure of strained La0.5Sr0.5CoO3 films under compression and tension. The lattice mismatch strain in these compounds affects both the bond lengths and the bond angles, though the larger effect on the bandwidth is due to the bond-length changes. The popular double exchange model for ferromagnetism in these compounds provides a correct qualitative description of the changes in Curie temperature TC, but quantitatively underestimates the changes. A microscopic model for ferromagnetism that provides a much stronger dependence on the structural distortions is needed.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States). National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 980476
• Report Number(s): BNL-93394-2010-JA; APPLAB; TRN: US1005506
• Journal Information: Applied Physics Letters, Vol. 93; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABSORPTION
BOND ANGLE
BOND LENGTHS
COMPRESSION
CURIE POINT
DIFFRACTION
FERROMAGNETISM
FILMS
FINE STRUCTURE
PERIPHERAL MODELS
STRAINS
THIN FILMS
national synchrotron light source