Effect of Jahn-Teller interactions on the specific heat and magnetic properties of charge-ordered La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds

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	Effect of Jahn-Teller interactions on the specific heat and magnetic properties of charge-ordered La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds
	T. Qian; R. K. Zheng; T. Zhang; T. F. Zhou; W. B. Wu; X. G. Li
	2005
发表期刊	Physical Review B
ISSN	1098-0121
卷号	72 期号:2
摘要	The effect of Jahn-Teller (JT) interactions on specific heat and magnetic properties was studied for the series of La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds by measurements of specific heat, ultrasonic velocity, and magnetization. Upon increasing x from 0.55 to 0.75, the enhancement of the JT interactions suppresses the ferromagnetic fluctuation above the charge ordering (CO) transition temperature T(CO), increases the change of entropy associated with the charge/orbital ordering transition, and therefore enhances the stability of the CO state. With further increasing x from 0.75 to 0.87, the ferromagnetic fluctuation gradually swells up and the change of entropy almost linearly decreases, due to the reduction of the JT interactions. The magnetic field dependence of T(CO) was estimated based on the Clausius-Clapeyron equation, which well coincides with that obtained from the transport measurements in high magnetic fields. These results imply that the JT effect is a key ingredient in understanding the essential physics of the CO state.
部门归属	univ sci & technol china, heifei natl lab phys sci microscale, anhua 230026, peoples r china. univ sci & technol china, dept mat sci & engn, anhua 230026, peoples r china. acad sinica, china int ctr mat phys, shenyang 110015, peoples r china.;qian, t (reprint author), univ sci & technol china, heifei natl lab phys sci microscale, anhua 230026, peoples r china;lixg@ustc.edu.cn
关键词	Manganites Phase La1-xsrxmno3 Transitions Stability State
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/35004
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	T. Qian,R. K. Zheng,T. Zhang,et al. Effect of Jahn-Teller interactions on the specific heat and magnetic properties of charge-ordered La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds[J]. Physical Review B,2005,72(2).
APA	T. Qian,R. K. Zheng,T. Zhang,T. F. Zhou,W. B. Wu,&X. G. Li.(2005).Effect of Jahn-Teller interactions on the specific heat and magnetic properties of charge-ordered La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds.Physical Review B,72(2).
MLA	T. Qian,et al."Effect of Jahn-Teller interactions on the specific heat and magnetic properties of charge-ordered La(1-x)Ca(x)MnO(3) (0.55 <= x <= 0.87) compounds".Physical Review B 72.2(2005).