Specific heat of single-crystal NdMnO3
文献类型：期刊论文
| 作者 | 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 |
| 刊名 | Acta Physica Sinica
 |
| 出版日期 | 2005 |
| 卷号 | 54期号:9页码:4359-4364 |
| 关键词 | specific heat Schottky anomaly antifierromagnetic order temperature specific-heat magnetic-structure la1-xcaxmno3 |
| ISSN号 | 1000-3290 |
| 中文摘要 | 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. |
| 原文出处 | |
| 公开日期 | 2012-04-14 |
| 源URL | [http://ir.imr.ac.cn/handle/321006/34824]  |
| 专题 | 金属研究所_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. |
入库方式： OAI收割
来源：金属研究所
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