Critical magnetic transition in TbNi2Mn-magnetization and Mossbauer spectroscopy
文献类型：期刊论文
| 作者 | Wang, JL ; Campbell, SJ ; Kennedy, SJ ; Zeng, R ; Dou, SX ; Wu, GH |
| 刊名 | JOURNAL OF PHYSICS-CONDENSED MATTER
 |
| 出版日期 | 2011 |
| 卷号 | 23期号:21 |
| 关键词 | NI-2 INTERMETALLIC COMPOUNDS EXCHANGE INTERACTIONS FE-57 MOSSBAUER R=RARE EARTH FE SUBSTITUTION DEPENDENCE BEHAVIOR FIELD FERROMAGNETS |
| ISSN号 | 0953-8984 |
| 通讯作者 | Wang, JL: Univ New S Wales, Australian Def Force Acad, Sch Phys Environm & Math Sci, Canberra, ACT 2600, Australia. |
| 中文摘要 | The structural and magnetic properties of the TbNi2Mnx series (0.9 <= x <= 1.10) have been investigated using x-ray diffraction, field-and temperature-dependent AC magnetic susceptibility, DC magnetization (5-340 K; 0-5 T) and Fe-57 Mossbauer spectroscopy (5-300 K). TbNi2Mnx crystallizes in the MgCu2-type structure (space group Fd (3) over barm). The additional contributions to the magnetic energy terms from transition-metal-transition-metal interactions (T-T) and rare-earth-transition-metal interactions (R-T) in RNi2Mn compounds contribute to their increased magnetic ordering temperatures compared with RNi2 and RMn2. Both the lattice constant a and the Curie temperature T-C exhibit maximal values at the x = 1 composition indicating strong magnetostructural coupling. Analyses of the AC magnetic susceptibility and DC magnetization data of TbNi2Mn around the Curie temperature T-C = 147 K confirm that the magnetic transition is second order with critical exponents beta = 0.77 +/- 0.12, gamma = 1.09 +/- 0.07 and delta = 2.51 +/- 0.06. These exponents establish that the magnetic interactions in TbNi2Mn are long range despite mixed occupancies of Tb and Mn atoms at the 8a site and vacancies. The magnetic entropy -Delta S-M around T-C is proportional to (mu H-0/T-C)(2/3) in agreement with the critical magnetic analyses. The Mossbauer spectra above T-C are fitted by two sub-spectra in agreement with refinement of the x-ray data while below T-C three sub-spectra are required to represent the three inequivalent local magnetic environments. |
| 收录类别 | SCI |
| 资助信息 | UNSW; Australian Institute of Nuclear Science and Engineering; Australian Research Council [DP0879070, LE0775559] |
| 语种 | 英语 |
| 公开日期 | 2013-09-17 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/35301]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Wang, JL,Campbell, SJ,Kennedy, SJ,et al. Critical magnetic transition in TbNi2Mn-magnetization and Mossbauer spectroscopy[J]. JOURNAL OF PHYSICS-CONDENSED MATTER,2011,23(21). |
| APA | Wang, JL,Campbell, SJ,Kennedy, SJ,Zeng, R,Dou, SX,&Wu, GH.(2011).Critical magnetic transition in TbNi2Mn-magnetization and Mossbauer spectroscopy.JOURNAL OF PHYSICS-CONDENSED MATTER,23(21). |
| MLA | Wang, JL,et al."Critical magnetic transition in TbNi2Mn-magnetization and Mossbauer spectroscopy".JOURNAL OF PHYSICS-CONDENSED MATTER 23.21(2011). |
入库方式： OAI收割
来源：物理研究所
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