Correlated polarons in dissimilar perovskite manganites

Surfaces of the perovskite manganites La1-xCaxMnO3

Slow Cooling of Hot Polarons in Halide Perovskite Solar Cells

Halide perovskites show unusual thermalization kinetics for above-bandgap photoexcitation. We explain this as a consequence of excess energy being deposited into discrete large polaron states. The crossover between low-fluence and high-fluence "phonon bottleneck" cooling is due to a Mott transition where the polarons overlap (n ≥ 1018 cm-3) and the phonon subpopulations are shared. We calculate...

Strongly correlated perovskite fuel cells.

Fuel cells convert chemical energy directly into electrical energy with high efficiencies and environmental benefits, as compared with traditional heat engines. Yttria-stabilized zirconia is perhaps the material with the most potential as an electrolyte in solid oxide fuel cells (SOFCs), owing to its stability and near-unity ionic transference number. Although there exist materials with superio...

The Structure of Jahn-teller Polarons in the Colossal Magnetoresistive Manganites

The observation of large negative magnetoresistive effects has generated tremendous scientific and technical interest in the perovskite manganites and related materials. These phenomena are commonly classified under the heading “colossal magnetoresistance” (CMR) to distinguish them from magnetoresistive effects in metals and metal-multilayers. CMR effects are observed in conjunction with the fo...

Coupling of Small Lattice Polarons to Magnetic Field in Magnetoresistive Manganites

We report Extended X-Ray Absorption Fine Structure measurements at the Mn K absorption edge on hole doped manganese oxides La1ÿxCaxMnO3 in a wide temperature range above and below the metal±insulator transition temperature in presence of a magnetic field. In accordance with previous studies an anomalous increase in the Debye-Waller factors is detected at the phase transition in the first coordi...