Low-field magnetic properties of La1-xCaxMnO3 (0 ≤ x ≤ 0.4)

被引:26
作者
Laiho, R [1 ]
Lisunov, KG
Lähderanta, E
Petrenko, P
Stamov, VN
Zakhvalinskii, VS
机构
[1] Univ Turku, Wihuri Phys Lab, Dept Phys, FIN-20014 Turku, Finland
[2] Inst Appl Phys, MD-2028 Kishinev, Moldova
关键词
antiferromagnetic materials; low-field properties; magnetization; magnetic compounds;
D O I
10.1016/S0304-8853(00)00023-8
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Magnetic properties of cubic La1-xCaxMnO3 (0 less than or equal to x 0.4) are investigated between T = 5 and 310 K in the external field of 2 G. The dependence of the ferromagnetic transition temperature on,x is analyzed with the model of spin polarons associated with electronic localization and electron-electron interaction. The bandwidth of the localized electrons is found to be W = 1.90 +/- 0.05 eV. In the samples with x < 0.2 and the Mn4+ concentration c < 0.26, a transition to a canted antiferromagnetic spin state is observed. The dependence of the transition temperature, T,, on c can be well described by a model including the Mn3+-Mn3+ superexchange and the Mn3+-Mn4+ double-exchange interactions. In the samples with,x less than or equal to 0.2 and c less than or equal to 0.22 the value of the critical exponent, y = 1.21 +/- 0.05, is obtained for the temperature dependence of the zero-field-cooled susceptibility function chi(-1) (T) similar to (T - T-C)(y), for T > T-C. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:271 / 277
页数:7
相关论文
共 32 条
[1]   Evidence for breakdown of ferromagnetic order below TC in the manganite La0.8Ca0.2MnO3 [J].
Chechersky, V ;
Nath, A ;
Isaac, I ;
Franck, JP ;
Ghosh, K ;
Ju, H ;
Greene, RL .
PHYSICAL REVIEW B, 1999, 59 (01) :497-502
[2]   Commensurate to incommensurate charge ordering and its real-space images in La0.5Ca0.5MnO3 [J].
Chen, CH ;
Cheong, SW .
PHYSICAL REVIEW LETTERS, 1996, 76 (21) :4042-4045
[3]   Magnetic and electric properties of La1-δMnO3 [J].
de Brion, S ;
Ciorcas, F ;
Chouteau, G ;
Lejay, P ;
Radaelli, P ;
Chaillout, C .
PHYSICAL REVIEW B, 1999, 59 (02) :1304-1310
[4]   EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].
DEGENNES, PG .
PHYSICAL REVIEW, 1960, 118 (01) :141-154
[5]  
DLO J, 1999, PHYS REV B, V59, P492
[6]   SERIES EXPANSION STUDY OF PAIR CONNECTEDNESS IN BOND PERCOLATION MODELS [J].
DUNN, AG ;
ESSAM, JW ;
RITCHIE, DS .
JOURNAL OF PHYSICS C-SOLID STATE PHYSICS, 1975, 8 (24) :4219-4235
[7]   Liquidlike spatial distribution of magnetic droplets revealed by neutron scattering in La1-xCaxMnO3 [J].
Hennion, M ;
Moussa, F ;
Biotteau, G ;
Rodriguez-Carvajal, J ;
Pinsard, L ;
Revcolevschi, A .
PHYSICAL REVIEW LETTERS, 1998, 81 (09) :1957-1960
[8]   Two-dimensional planar ferromagnetic coupling in LaMnO3 [J].
Hirota, K ;
Kaneko, N ;
Nishizawa, A ;
Endoh, Y .
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1996, 65 (12) :3736-3739
[9]   LATTICE EFFECTS ON THE MAGNETORESISTANCE IN DOPED LAMNO3 [J].
HWANG, HY ;
CHEONG, SW ;
RADAELLI, PG ;
MAREZIO, M ;
BATLOGG, B .
PHYSICAL REVIEW LETTERS, 1995, 75 (05) :914-917
[10]  
KASUYA T, 1968, REV MOD PHYS, V40, P648