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
Source PublicationPHYSICAL REVIEW B
Volume95Issue:13Pages:134405
Status已发表
DOI10.1103/PhysRevB.95.134405
Abstract

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.

Subject Area磁学
MOST Discipline Catalogue理学::物理学
Corresponding AuthorPrincep A. J. ; Boothroyd A. T.
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Cited Times:16[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttps://kms.shanghaitech.edu.cn/handle/2MSLDSTB/16338
Collection物质科学与技术学院_PI研究组_郭艳峰组
Corresponding AuthorPrincep A. J.; Boothroyd A. T.
Affiliation1.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,
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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.
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