Raman studies of manganese dioxide (MnO2), a crucial material for sustainable and
innovative solutions in energy storage and environmental remediation, have predominantly …

Abstract The cooperative Jahn-Teller coupling between the Mn eg electrons and the oxygen
octahedral distortions in LaMnO 3 is studied using ab initio density-functional calculations …

The microscopic origin of the exchange interaction in manganites is studied by solving an
electronic model Hamiltonian for the Mn-O-Mn triad. It is shown that the magnetic structure of …

Magnetic cooling based on magnetocaloric effect (MCE) is a simple, convenient, and more
promising attractive cooling technology than the classical one used in the vapour …

Doped and undoped manganites are modeled by the coupling between itinerant eg
electrons and static t 2 g spins, the Jahn-Teller and breathing phonon modes, and the …

We study phase transitions in the colossal-magnetoresistive manganites by using a mean-
field theory both at zero and non-zero temperatures. Our Hamiltonian includes double …

A simple, exactly solvable three-site Mn–O–Mn model is studied to extend the Anderson–
Hasegawa treatment of double exchange (DEX) to include the effects of the electron–lattice …

Based on a recently developed variational method, we explore the properties of the Holstein
polaron (HP) on an infinite lattice in D dimensions, where 1≤ D≤ 4. We present the most …

Electric resistance and effect of hydrostatic pressure on magnetic properties has been
studied on the La_0.8K_0.2MnO_3 nanoparticles. Magnetic phase transition is affected by …

This work contains studies of two classes of perovskite transition metal oxides. The first class
is the layered perovskite cuprates and the related nickelate. The second class is the three …