Phonon dynamics of lanthanum manganiteLaMnO3using an interatomic shell model potential

Bulk modulus and thermodynamic properties of electron-doped calcium manganate—Ca1−xRExMnO3

“…Our HT y D for LaMnO 3 is 497 K and it is close to the reported value of 515 K of Ref. [8]. For Ca 1Àx La x MnO 3 with…”

“…Similar findings were reported earlier also. To illustrate, it is clear from our earlier investigations on LaMnO 3 that Debye temperature is dependent on temperature and its value at high temperature is more than the value at low temperatures [8]. It was also established that, for compounds whose LT Debye temperature is different from HT Debye temperature, for such solids Debye model with one Debye temperature (LT) does not account for all the specific heat as the contribution of optical phonons at higher temperature cannot be neglected and some other formulation such as Einstein model with more than one Einstein temperature is used to calculate the specific heat.…”

“…It is established that these compounds are predominantly ionic in nature hence our MRIM model has performed satisfactorily in predicting the thermal properties of these rare earth manganites. Earlier also we have used the RIM model successfully to study the thermal properties of some perovskite manganites and other inorganic compounds over a fairly wide range of temperature [8][9][10][11][12].…”

Heat capacity of EuMnO3 and Eu0.7A0.3MnO3 (A=Ca, Sr) compounds

“…We have formulated the RIM by including the effects of the long-range (LR) Coulomb attraction, the short-range (SR) Hafemeister Flygare (HF) type overlap repulsion operative up to second nearest neighbour and Van der Waal's (VdW) interaction due to dipole-dipole interaction [15][16][17]. The total interaction potential (f) is given by…”

Effect of cation doping on low-temperature specific heat of LaMnO3 manganite

“…This report motivated us to formulate Rigid Ion Model (RIM) to describe the thermal properties of La 1Àx Ca x MnO 3 compounds. Earlier we have used the RIM model successfully to study the thermal properties of some perovskite manganites and other inorganic compounds over a fairly wide range of temperatures [5][6][7][8][9]. As the electronic and magnetic phase diagram of La 1Àx Ca x MnO 3 is well established for all the values of concentration (x) [10], the main focus of the present paper is to explore temperature dependence of the lattice specific heat of La 1Àx Ca x MnO 3 in different regions of its phase diagram (x ¼ 0.125, 0.175, 0.25, 0.35, 0.50, 0.67 and 0.75).…”