Specific heat of Cd-doped manganites

Analysis of Thermodynamic and Phononic Properties of Perovskite Manganites

“…The calculated value of Debye temperature (θ D ) for RMn 1-x Ga x O 3 (R = Ho, Y and x =0, 0.03, 0.1, 0.2 and 0.3) is approximately in agreement and comparable with the corresponding data (577 K and 628 K) available only at room temperature for HoMnO 3 and YMnO 3 (Zhou et al, 2006;Renu Choithrani et al, 2011). The calculated values of (θ D ) for RMn 1-x Ga x O 3 (R = Ho, Y and x =0, 0.03, 0.1, 0.2 and 0.3) at 300 K are ranging from 577.11 K to 622.05 K, which lie within the Debye temperature range (300-650 K) often found in perovskite manganites -2010. The Grüneisen parameters () obtained by the author are found to lie between 2 and 3, which are similar to the values observed by Dai et al, 1996.…”

“…Recently, a modified rigid ion model (MRIM) has been developed by the author -2010 to elucidate the cohesive, thermal and thermodynamic properties of pure and doped perovskite manganites and the study is recognized in journals of international repute with high impact factor, awarded and appreciated by the eminent scientists, Nobel Laureates, reputed national and international Universities, Research Centres and R & D groups.…”

“…The author has recently developed an extended rigid ion model (ERIM) by incorporating the the long-range (LR) Coulomb attraction, the short-range (SR) Hafemeister-Flygare (HF) type overlap repulsion effective up to the second neighbour ions, the van der Waals (vdW) attraction due to the dipole-dipole (d-d) and dipole-quadrupole (d-q) interactions and zero point energy (ZPE) effects in the framework of modified rigid ion model (MRIM) developed earlier by us -2010.…”

Structural and phonon dynamical properties of perovskite manganites: (Tb, Dy, Ho)MnO3

“…The calculated values of Debye temperatures (y D ) 574 K (TbMnO 3 ), 574 K (DyMnO 3 ) and 577 K (HoMnO 3 ) at 300 K are in fair agreement and comparable with the corresponding experimental values (300-600 K) often found in perovskite manganites [19]. The values of y D have been plotted against the temperature (up to the range of 1000 K) in Fig.…”

“…The magnetization of TbMnO 3 shows two sharp peaks around 27 and 42 K. In case of HoMnO 3 , there are magnetic transitions below 60 K as are observed by Tachibana et al [17] and Munoz et al [18]; a sharp peak around T N $ 40 K marks antiferromagnetic (AF) transition into the incommensurate (IC) phase, additional anomaly is observed at T 0 N $5-15 K and this feature is ascribed to a lockin-transition to the E-type structure. A modified rigid ion model (MRIM) has been recently developed by some of us [19] to elucidate the cohesive, thermal and thermodynamic properties of the pure and doped perovskite manganites, probably for the first time. Also, the lattice dynamical studies of (Sm, Eu, Gd)MnO 3 [20], LaMnO 3 [21] and YMnO 3 [22] have been performed by using a seven parameter shell model [23][24][25] based on a transferable interatomic potential.…”