Heat capacity, entropy and volume change near phase transition temperature in La1-xCaxMnO3

被引：3

作者：

Biernacki, SW ^{[1
]}

机构：

[1] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland

来源：

SOLID STATE COMMUNICATIONS | 2000年 / 116卷 / 09期

关键词：

magnetically ordered materials; electron-phonon interaction; heat capacity; order-disorder effects;

D O I：

10.1016/S0038-1098(00)00369-0

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The two-level semiempirical model of the ferromagnetic ordering in the La1-xCaMnO3 (x approximate to 0.2-0.33) crystals is described. The partition function for the ferromagnetic to paramagnetic phase transition is determined and the Curie temperature, T-C, is expressed in terms of the model parameters. Since around T-C the partition function undergoes an abrupt drop, the crystal exhibits unusual changes in its properties at this temperature. The change of the specific heat capacity, entropy and volume is calculated. The influence of magnetic field on the heat capacity is discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

收藏

页码：471 / 476

页数：6

相关论文

共 15 条

[1] ELECTRON LOCALIZATION IN MIXED-VALENCE MANGANITES [J].

COEY, JMD ;

VIRET, M ;

RANNO, L ;

OUNADJELA, K .

PHYSICAL REVIEW LETTERS, 1995, 75 (21) :3910-3913

[2] Experimental evidence for the dynamic Jahn-Teller effect in La0.65Ca0.35MnO3 [J].

Dai, P ;

Zhang, JD ;

Mook, HA ;

Liou, SH ;

Dowben, PA ;

Plummer, EW .

PHYSICAL REVIEW B, 1996, 54 (06) :R3694-R3697

[3] 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

[4]

Kumar N, 1998, COLOSSAL MAGNETORESISTANCE, CHARGE ORDERING AND RELATED PROPERTIES OF MANGANESE OXIDES, P305

[5] DOUBLE EXCHANGE ALONE DOES NOT EXPLAIN THE RESISTIVITY OF LA1-XSRXMNO3 [J].

MILLIS, AJ ;

LITTLEWOOD, PB ;

SHRAIMAN, BI .

PHYSICAL REVIEW LETTERS, 1995, 74 (25) :5144-5147

[6] SIMULTANEOUS STRUCTURAL, MAGNETIC, AND ELECTRONIC-TRANSITIONS IN LA1-XCAXMNO3 WITH X=0.25 AND 0.50 [J].

RADAELLI, PG ;

COX, DE ;

MAREZIO, M ;

CHEONG, SW ;

SCHIFFER, PE ;

RAMIREZ, AP .

PHYSICAL REVIEW LETTERS, 1995, 75 (24) :4488-4491

[7] Thermodynamic and electron diffraction signatures of charge and spin ordering in La1-xCaxMnO3 [J].

Ramirez, AP ;

Schiffer, P ;

Cheong, SW ;

Chen, CH ;

Bao, W ;

Palstra, TTM ;

Gammel, PL ;

Bishop, DJ ;

Zegarski, B .

PHYSICAL REVIEW LETTERS, 1996, 76 (17) :3188-3191

[8] Lattice effects in the colossal-magnetoresistance manganites [J].

Roder, H ;

Zang, J ;

Bishop, AR .

PHYSICAL REVIEW LETTERS, 1996, 76 (08) :1356-1359

[9] PRESSURE-INDUCED ELECTRONIC CHANGES IN COMPOUNDS OF IRON [J].

SLICHTER, CP ;

DRICKAMER, HG .

JOURNAL OF CHEMICAL PHYSICS, 1972, 56 (05) :2142-+

[10]

STURGE MD, 1967, SOLID STATE PHYS, V20, P99