Specific heat of single-crystal NdMnO3

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	Specific heat of single-crystal NdMnO3
	J. G. Cheng; Y. Sui; Z. N. Qian; Z. G. Liu; X. Q. Huang; J. P. Miao; Z. Lu; X. J. Wang; W. H. Su
	2005
发表期刊	Acta Physica Sinica
ISSN	1000-3290
卷号	54 期号:9 页码:4359-4364
摘要	The temperature and field dependences of the specific heat of single-crystal NdMnO3 were investigated from 2K to 200K under different fields up to 8T.Coffesponding to the Type-A antiferromagnetic (A-AF) phase transition in the Mn sub- lattice, the specific heat under zero field exhibited a sharp lambda-shaped peak at about 85K, which was depressed and broadened and changed smoothly with the increase of magnetic field. But the entropy change due to the magnetic order is only 26% of the expected value,which might arise from the extension of the magnetic fluctuation in a larger temperature range.The specific heat curves exhibited a shoulder-shaped Schottky-like anomaly below 20K, whose maximum shifts gradually to higher temperatures with the magnetic field.By considering the contributions to the specific heat at low temperatures,the above phenomena can be interpreted in terms of the model of effective molecular field (H-mf) at Nd3+ site that causes the splitting of the ground state doublet ( GSD) of Nd3+. The specific heat below 20K under different magnetic fields was successfully fitted, through which the meaningful parameters, including the splitting of the GSD of Nd3+ Debye temperature. and the A-AF spin wave stiffness coefficients,as well as their field dependence were obtained. It was found that the ferromagnetic component of the Mn sub-lattice caused by the GdFeO3-type octahedron rotation could be the origin of the H-mf.
部门归属	harbin inst technol, dept appl phys, ccmst, harbin 150001, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;sui, y (reprint author), harbin inst technol, dept appl phys, ccmst, harbin 150001, peoples r china;suiyu@hiti.edu.cn
关键词	Specific Heat Schottky Anomaly Antifierromagnetic Order Temperature Specific-heat Magnetic-structure La1-xcaxmno3
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WOS记录号	WOS:000231569500072
引用统计	被引频次：2[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/34824
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	J. G. Cheng,Y. Sui,Z. N. Qian,et al. Specific heat of single-crystal NdMnO3[J]. Acta Physica Sinica,2005,54(9):4359-4364.
APA	J. G. Cheng.,Y. Sui.,Z. N. Qian.,Z. G. Liu.,X. Q. Huang.,...&W. H. Su.(2005).Specific heat of single-crystal NdMnO3.Acta Physica Sinica,54(9),4359-4364.
MLA	J. G. Cheng,et al."Specific heat of single-crystal NdMnO3".Acta Physica Sinica 54.9(2005):4359-4364.