RT Journal Article
T1 Insulating ferromagnetic LaCoO_(3−δ) films: a phase induced  by ordering of oxygen vacancies
A1 Biskup Zaja, Nevenko
A1 Salafranca, Juan
A1 Mehta, Virat
A1 Oxley, Marrk P.
A1 Suzuki, Yuri
A1 Pennycook, Stephen J.
A1 Pantelides, Sokrates T.
A1 Varela Del Arco, María
AB The origin of ferromagnetism in strained epitaxial LaCoO_(3) films has been a long-standing mystery. Here, we combine atomically resolved Z-contrast imaging, electron-energy-loss spectroscopy, and density-functional calculations to demonstrate that, in epitaxial LaCoO_(3) films, oxygen-vacancy superstructures release strain, control the film’s electronic properties, and produce the observed ferromagnetism via the excess electrons in the Co d states. Although oxygen vacancies typically dope a material n-type, we find that ordered vacancies induce Peierls-like minigaps which, combined with strain relaxation, trigger a nonlinear rupture of the energy bands, resulting in insulating behavior.
PB Amercian Physical Society
SN 0031-9007
YR 2014
FD 2014
LK https://hdl.handle.net/20.500.14352/91493
UL https://hdl.handle.net/20.500.14352/91493
LA eng
NO Biškup, N., Salafranca, J., Mehta, V., Oxley, M. P., Suzuki, Y., Pennycook, S. J., ... & Varela, M. (2014). Insulating ferromagnetic LaCoO 3− δ films: A phase induced by ordering of oxygen vacancies. Physical Review Letters, 112(8), 087202.
NO Department of Energy (Estados Unidos)
NO European Commission
DS Docta Complutense
RD 23 abr 2025