Polaronic excitations in colossal magnetoresistance manganite films

Origin of colossal magnetoresistance in LaMnO3 manganite.

Phase separation is a crucial ingredient of the physics of manganites; however, the role of mixed phases in the development of the colossal magnetoresistance (CMR) phenomenon still needs to be clarified. We report the realization of CMR in a single-valent LaMnO3 manganite. We found that the insulator-to-metal transition at 32 GPa is well described using the percolation theory. Pressure induces ...

Colossal magnetoresistive manganite thin films

Mixed-valence perovskite manganites (Re 1−x A x MnO 3 where Re=rare earth, A=alkaline earth) provide a unique opportunity to study the relationships between the structure and the magnetotransport properties due to an interplay among charge carriers, magnetic coupling, orbital ordering and structural distortion. This makes these compounds very exciting from both the basic research and from the t...

Colossal magnetoresistance

We review recent experimental work falling under the broad classification of colossal magnetoresistance (CMR), which is magnetoresistance associated with a ferromagnetic-toparamagnetic phase transition. The prototypical CMR compound is derived from the parent compound, perovskite LaMnO3. When hole doped at a concentration of 20–40% holes/Mn ion, for instance by Ca or Sr substitution for La, the...

Colossal Magnetoresistance

Colossal magnetoresistance (CMR) effect was discovered among the manganese oxide class of materials, i.e. La1−xCaxMnO3. It shows large magnetoresistance by orders of magnitude, however several environmental requirements limit CMR toward general applications. Recently people have been focused on understanding a fundamental physics because of complex correlations between electron-lattice and elec...

Colossal Magnetoresistance