Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca)
文献类型：期刊论文
| 作者 | Guo, YF ; Princep, AJ ; Zhang, X ; Manuel, P ; Khalyavin, D ; Mazin, II ; Shi, YG ; Boothroyd, AT |
| 刊名 | PHYSICAL REVIEW B
 |
| 出版日期 | 2014 |
| 卷号 | 90期号:7 |
| ISSN号 | 1098-0121 |
| 通讯作者 | Guo, YF (reprint author), Univ Oxford, Dept Phys, Clarendon Lab, Parks Rd, Oxford OX1 3PU, England. |
| 中文摘要 | We report powder and single-crystal neutron diffraction measurements of the magnetic order in AMnBi(2) (A = Sr and Ca), two layered manganese pnictides with anisotropic Dirac fermions on a Bi square net. Both materials are found to order at T-N approximate to 300 K in k = 0 antiferromagnetic structures, with ordered Mn moments at T = 10 K of approximately 3.8 mu(B) aligned along the c axis. The magnetic structures are Neel type within the Mn-Bi layers, but the interlayer ordering is different, being antiferromagnetic in SrMnBi2 and ferromagnetic in CaMnBi2. This allows a mean-field coupling of the magnetic order to Bi electrons in CaMnBi2 but not in SrMnBi2. We find clear evidence that magnetic order influences electrical transport. First-principles calculations explain the experimental observations and suggest that the mechanism for different interlayer ordering in the two compounds is the competition between the antiferromagnetic superexchange and ferromagnetic double exchange carried by itinerant Bi electrons. |
| 资助信息 | U.K. Engineering and Physical Sciences Research Council; 973 project of the Ministry of Science and Technology of China [2011CB921701]; National Natural Science Foundation of China [11274367]; Office of Naval Research (ONR) through the Naval Research Laboratory's Basic Research Program |
| 语种 | 英语 |
| 公开日期 | 2015-04-14 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/59519]  |
| 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 | Guo, YF,Princep, AJ,Zhang, X,et al. Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca)[J]. PHYSICAL REVIEW B,2014,90(7). |
| APA | Guo, YF.,Princep, AJ.,Zhang, X.,Manuel, P.,Khalyavin, D.,...&Boothroyd, AT.(2014).Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca).PHYSICAL REVIEW B,90(7). |
| MLA | Guo, YF,et al."Coupling of magnetic order to planar Bi electrons in the anisotropic Dirac metals AMnBi(2) (A = Sr, Ca)".PHYSICAL REVIEW B 90.7(2014). |
入库方式： OAI收割
来源：物理研究所
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