Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi(2) (A = Sr, Ca)

doi:10.1103/PhysRevB.95.134405

	Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi(2) (A = Sr, Ca)
	Rahn M. C.; Princep A. J.; Piovano A.; Kulda J.; Guo YF(郭艳峰); Shi Y. G.; Boothroyd A. T.
	2017-04-04
发表期刊	PHYSICAL REVIEW B
卷号	95 期号:13 页码:134405
发表状态	已发表
DOI	10.1103/PhysRevB.95.134405
摘要	The square Bi layers in AMnBi(2) (A = Sr, Ca) host Dirac fermions which coexist with antiferromagnetic order on the Mn sublattice below T-N = 290 K (Sr) and 265 K (Ca). We have measured the spin-wave dispersion in these materials by triple-axis neutron spectroscopy. The spectra show pronounced spin gaps of 10.2(2) meV (Sr) and 8.3(8) meV (Ca) and extend to a maximum energy transfer of 61-63 meV. The observed spectra can be accurately reproduced by linear spin-wave theory from a Heisenberg effective spin Hamiltonian. Detailed global fits of the full magnon dispersion are used to determine the in-plane and interlayer exchange parameters as well as well as the magnetocrystalline anisotropy constant. To within experimental error we find no evidence that the magnetic dynamics are influenced by the Dirac fermions.
学科领域	磁学
学科门类	理学::物理学
通讯作者	Princep A. J. ; Boothroyd A. T.
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/16338
专题	物质科学与技术学院_PI研究组_郭艳峰组
通讯作者	Princep A. J.; Boothroyd A. T.
作者单位	1.Department of Physics, Oxford University 2.Institute of Laue Langevin 3.School of Physical Science and Technology, ShanghaiTech University 4.CAS Center for Excellence in Superconducting Electronics 5.Beijing National Laboratory for Condensed Matter Physics,
推荐引用方式 GB/T 7714	Rahn M. C.,Princep A. J.,Piovano A.,et al. Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi(2) (A = Sr, Ca)[J]. PHYSICAL REVIEW B,2017,95(13):134405.
APA	Rahn M. C..,Princep A. J..,Piovano A..,Kulda J..,Guo YF.,...&Boothroyd A. T..(2017).Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi(2) (A = Sr, Ca).PHYSICAL REVIEW B,95(13),134405.
MLA	Rahn M. C.,et al."Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi(2) (A = Sr, Ca)".PHYSICAL REVIEW B 95.13(2017):134405.