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

被引：23

作者：

Tang, G. D. ^{[1
]}

Liu, S. P.

Zhao, X.

Zhang, Y. G.

Ji, D. H.

Li, Y. F.

Qi, W. H.

Chen, W.

Hou, D. L.

机构：

[1] Hebei Normal Univ, Dept Phys, Shijiazhuang 050016, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 12期

基金：

中国国家自然科学基金;

关键词：

MAGNETORESISTANCE; X=0.25;

D O I：

10.1063/1.3233934

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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. (C) 2009 American Institute of Physics. [doi:10.1063/1.3233934]

引用

页数：3

共 17 条

[1] CONSIDERATIONS ON DOUBLE EXCHANGE [J].

ANDERSON, PW ;

HASEGAWA, H .

PHYSICAL REVIEW, 1955, 100 (02) :675-681

[2]

Ashcroft N. W., 1976, SOLID STATE PHYS, P395

[3] Effects of A-site ordering on the structures and properties of La1-xBaxMnO3 (x∼0.5) -: art. no. 104426 [J].

Chmaissem, O ;

Dabrowski, B ;

Kolesnik, S ;

Mais, J ;

Jorgensen, JD ;

Short, S ;

Botez, CE ;

Stephens, PW .

PHYSICAL REVIEW B, 2005, 72 (10)

[4] Colossal magnetoresistant materials: The key role of phase separation [J].

Dagotto, E ;

Hotta, T ;

Moreo, A .

PHYSICS REPORTS-REVIEW SECTION OF PHYSICS LETTERS, 2001, 344 (1-3) :1-153

[5] Specific heat of La1-xCaxMnO3-δ [J].

Ghivelder, L ;

Castillo, IA ;

Alford, NM ;

Tomka, GJ ;

Riedi, PC ;

MacManus-Driscoll, J ;

Hossain, AKMA ;

Cohen, LF .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1998, 189 (03) :274-282

[6] Local distortions in the colossal magnetoresistive manganates La0.70Ca0.30MnO3, La0.80Ca0.20MnO3 and La0.70Sr0.30MnO3 revealed by total neutron diffraction [J].

Hibble, SJ ;

Cooper, SP ;

Hannon, AC ;

Fawcett, ID ;

Greenblatt, M .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1999, 11 (47) :9221-9238

[7]

IBACH H, 1995, SOLID STATE PHYS, P81

[8] High-temperature thermopower in La2/3Ca1/3MnO3 films: Evidence for polaronic transport [J].

Jaime, M ;

Salamon, MB ;

Rubinstein, M ;

Treece, RE ;

Horwitz, JS ;

Chrisey, DB .

PHYSICAL REVIEW B, 1996, 54 (17) :11914-11917

[9] Uncorrelated and correlated nanoscale lattice distortions in the paramagnetic phase of magnetoresistive manganites [J].

Kiryukhin, V ;

Borissov, A ;

Ahn, JS ;

Huang, Q ;

Lynn, JW ;

Cheong, SW .

PHYSICAL REVIEW B, 2004, 70 (21) :1-8

[10] Dynamic Jahn-Teller effect and colossal magnetoresistance in La1-xSrxMnO3 [J].

Millis, AJ ;

Shraiman, BI ;

Mueller, R .

PHYSICAL REVIEW LETTERS, 1996, 77 (01) :175-178

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