Analysis of low temperature specific heat in Nd0.5Sr0.5MnO3 and R0.5Ca0.5MnO3 (R=Nd, Sm, Dy and Ho) compounds

Study of calcium doping effect on thermophysical properties of some perovskite manganites

“…(5) Table 1. Using these values of model parameters, we have computed the cohesive energy ( ), molecular force constant (f), compressibility (ˇ), Restrahalen frequency ( 0 ), Debye temperature (Â D ) and Grüneisen parameter ( ) by using their expressions reported by us [8][9][10][11]. The computed results on them are listed in Table 2 and some of them are found to be in somewhat good agreement with the experimental data [7,18,19] available only for the composition (x = 0.5).…”

“…The values of c kk and d kk are evaluated using the Eqs. (3) and (4) and following the procedure prescribed by us [8][9][10][11].…”

“…Besides, we have computed the cohesive energy ( ), molecular force constant (f), compressibility (ˇ), Restrahalen frequency ( 0 ), Debye temperature (Â D ) and Grüneisen parameter ( ) for Nd 0.04 Sm 0.16 Ca 0.8 MnO 3 and Pr 1−x Ca x MnO 3 (0.3 ≤ x ≤ 0.5) compounds using their expressions given in our earlier papers [8][9][10][11]. The results thus obtained are presented and discussed below.…”

“…The specific heat, as a fundamental thermophysical quantity, is complementary to the magnetic and transport properties. In this paper, we have described the specific heat and thermodynamic parameters of Nd 0.04 Sm 0.16 Ca 0.8 MnO 3 and Pr 1−x Ca x MnO 3 (0.3 ≤ x ≤ 0.5) manganites in detail using the modified rigid ion model (MRIM) developed by us [8][9][10][11].…”

Influence of temperature and composition on cohesive and thermal properties of mixed crystal manganites

“…These properties depend on the motion of the constituent atoms of the crystals and can be explained by the theoretical models. Therefore, the purpose of the present investigation is to describe the cohesive and thermal properties, like the cohesive energy (f), Restrahalen frequency (u 0 ), Debye temperature (y D ), Grüneisen parameter (g) and specific heat (C(T)) of the doped manganites at different temperatures (2-300 K) and concentrations (x ¼ 0.0-1.0) using a theoretical model [5][6][7][8][9].…”