TITLE

Study of the free energy of the La1-xCaxMnO3 manganites based on the temperature dependence of the crystal cell volume

AUTHOR(S)
Tang, G. D.; Liu, S. P.; Zhao, X.; Zhang, Y. G.; Ji, D. H.; Li, Y. F.; Qi, W. H.; Chen, W.; Hou, D. L.
PUB. DATE
September 2009
SOURCE
Applied Physics Letters;9/21/2009, Vol. 95 Issue 12, p121906
SOURCE TYPE
DOC. TYPE
Article
ABSTRACT
A study of the free energy of the perovskite manganites was performed by fitting experimental results for the temperature dependence of the crystal cell volume using a detailed semiclassical model of the free energy. The fitted results coincide with the experimental results for the samples La1-xCaxMnO3 (x=0.2, 0.25, 0.3, and 0.5). The free energy includes the energy corresponding to thermal vibration of the crystal lattice, the ionic cohesive energy, and additional energies produced by electrical carriers from the double exchange mechanism and the thermal activation of small polarons.
ACCESSION #
44374761

Related Articles

• Statistical theory of forming structural vacancies in palladium hydride. Zaginaichenko, S. Yu.; Matysina, Z. A.; Shchur, D. V. // Russian Physics Journal;Jul2011, Vol. 54 Issue 2, p199

Based on molecular-kinetic representations, the theory of forming structural vacancies and vacant-ordered superstructure of CuAu type in palladium hydride is developed. Free energies of PdH and PdVH phases are calculated. The constitution diagram is constructed that determines ranges of...

• Finite-size corrections to the free energies of crystalline solids. Polson, J. M.; Polson, J.M.; Trizac, E.; Pronk, S.; Frenkel, D. // Journal of Chemical Physics;3/22/2000, Vol. 112 Issue 12

We analyze the finite-size corrections to the free energy of crystals with a fixed center of mass. When we explicitly correct for the leading (ln N/N) corrections, the remaining free energy is found to depend linearly on 1/N. Extrapolating to the thermodynamic limit (Nâ†’âˆž), we...

• Metal-Insulator Transition in the Hubbard Model: Correlations and Spiral Magnetic Structures. Timirgazin, Marat; Igoshev, Petr; Arzhnikov, Anatoly; Irkhin, Valentin // Journal of Low Temperature Physics;Dec2016, Vol. 185 Issue 5/6, p651

The metal-insulator transition (MIT) for the square, simple cubic, and body-centered cubic lattices is investigated within the t- $$t^\prime$$ Hubbard model at half-filling by using both the generalized for the case of spiral order Hartree-Fock approximation (HFA) and Kotliar-Ruckenstein...

• The Bogolubov representation of the polaron model and its completely integrable RPA-approximation. Bogolubov, N. N.; Prykarpatsky, Ya. A.; Ghazaryan, A. A. // Condensed Matter Physics;Jul2010, Vol. 13 Issue 2, p1

The polaron model in ionic crystal is studied in the Bogolubov representation using a special RPA-approximation. A new exactly solvable approximated polaron model is derived and described in detail. Its free energy at finite temperature is calculated analytically. The polaron free energy in the...

• Phase stabilities of â€œmorphotropicâ€ phases in Pb(Zn[sub 1/3]Nb[sub 2/3])O[sub 3]â€“PbTiO[sub 3] single crystals. Lu, Yu; Jeong, D.-Y.; Cheng, Z.-Y.; Shrout, T.; Zhang, Q. M. // Applied Physics Letters;3/18/2002, Vol. 80 Issue 11, p1918

Based on the optic and dielectric data acquired under different mechanical and electric conditions and temperature, we show that an orthorhombic phase exists near the morphotropic phase boundary (MPB) (on both the rhombohedral and tetragonal sides of MPB). Because of the proximity of the free...

• Lattice effect on magnetism in CMR perovskite La[sub 0.85] Sr[sub 0.15] MnO[sub z]. Zhang, N.; Ding, W.; Zhong, W.; Du, K.; Wang, K.; Du, Y. // Applied Physics A: Materials Science & Processing;1997, Vol. 65 Issue 1, p77

The grain size dependencies of magnetic properties in the granular perovskite La[sub 0.85] Sr[sub 0.15] MnO[sub 3] system has been investigated. Enlargements of lattice parameters with grain growth have been observed. Associated with this growth are a series of magnetic changes, including...

• Effect of Cation Radius on Heat capacity of AGeO3 (A = Mg, Ca) Perovskites. Gaur, N. K.; Parveen, Atahar; Srivastava, Archana; Thakur, Rasna // AIP Conference Proceedings;7/16/2011, Vol. 1349 Issue 1, p973

We report the effect of A-site alkaline earth ion radius on thermal and cohesive properties of the germanate perovskites AGeO3 (A = Mg, Ca) computed by the means of a rigid ion model (RIM). We report the calculated lattice specific heat at very low temperatures which obeys T3 law thereby...

• Relaxation of Multiwell Energies in Linearized Elasticity and Applications to Nematic Elastomers. Cesana, Pierluigi // Archive for Rational Mechanics & Analysis;Sep2010, Vol. 197 Issue 3, p903

The relaxation of a free-energy functional which describes the orderï¿½strain interaction in nematic elastomers is obtained explicitly. We work in the regime of small strains (linearized kinematics). Adopting the uniaxial order tensor theory (Frank model) to describe the liquid crystal order,...

• Structural analysis by reduced data: VII. Experimental check of the new method for refining the parameters of the model describing the absorption of radiation by a specimen. Dudka, A. P. // Crystallography Reports;Jan2006, Vol. 51 Issue 1, p157

A new approach to refinement of the parameters determining the absorption of radiation by a single-crystal specimen is used to refine the structural models of three ellipsoidal crystals and a polyhedral crystal. The use of this approach significantly increased the relative precision of the...

Share