Nature Materials
Artificially layered structures of complex oxides can generate unexpected new functionalities. We have demonstrated how interfacial interactions can induce a complex magnetic structure in a non-magnetic material, as revealed by the observation of exchange bias in superlattices composed of (111)-oriented layers of paramagnetic LaNiO3 and ferromagnetic LaMnO3.
Marta Gibert et al., Nature Materials , (2012).
See also research topics on Nickelates |
Physical Review Letters
We present a direct comparison between experimental data and ab initio calculations for the electrostrictive effect in the polar LaAlO3 layer grown on SrTiO3 substrates. From the structural data, a complete screening of the LaAlO3 dipole field is observed for film thicknesses between 6 and 20 uc. For thinner films, an expansion of the c axis of 2% matching the theoretical predictions for an electrostrictive effect is observed experimentally.
C. Cancellieri et al., Physical Review Letters 107, 056120 (2011).
See also research topics on New Phenomena at Oxide Interfaces |
Physical Review Letters
LaNiO3, a paramagnetic metal in the bulk, goes through a metal-insulator transition driven by a dimensional crossover as the film thickness is reduced to only a few unit cells. Quantum corrections to the conductivity are observed in the vicinity of the transition, which are accurately described by weak localization in the presence of magnetic fluctuations.
R. Scherwitzl et al., Physical Review Letters 106, 246403 (2011).
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Applied Physics Letters
The structural and electrical properties of epitaxial Pb(Zr0.2Ti0.8)O3 thin films grown on 2 in. (001) silicon wafers were investigated. Using x-ray diffraction, the lattice behavior of the heterostructure has been studied as a function of temperature, suggesting a 250°C increase of the Pb(Zr0.2Ti0.8)O3 ferroelectric-paraelectric transition temperature with respect to the bulk value. This significant enhancement of the critical temperature is understood in terms of a two-dimensional clamping effect.
A. Sambri et al., Applied Physics Letters 98, 12903 (2010).
See also research topics on New Phenomena at Oxide Interfaces |
