Effect of heavy cation doping on thermal properties of LaMnO3

Abstract

: Effect of heavy cation doping (Ca 2+ at the A-site) on the thermal properties of perovskite LaMnO 3 has been investigated using the Rigid Ion Model (RIM)). As strong electron-phonon interactions are present in these compounds, the lattice part of the specific heat deserves proper attention. The specific heat of magnetoresistance compound La 0.25 Ca 0.75 MnO 3 as a function of temperature (10 K ≤ T ≤ 300 K) is reported. Our results on specific heat are in good agreement with the measured values of specific heat at lower temperatures. In addition, the results on the cohesive energy (φ), molecular force constant (f ), Restrahalen frequency (ν 0 ), Debye temperature (Θ D ) and Gruneisen parameter (γ) are also discussed.

Asymmetry to symmetry transition of Fano line-shape: analytical description

“…However the discussion will be limited to the classical Fano effect in this paper. In solid state, the Fano effect is understood in terms of electron-phonon interaction [8][9][10] provided the solid state system contains an available discrete level and a filled continuum of states. Apart from bulk materials, Fano effect has been observed in nanostructures [11][12][13] and heavily doped semiconductors [14][15][16].…”