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Spin dynamics in the antiferromagnetic phases of the Dirac metals AMnBi2 (A = Sr, Ca)

Abstract:

The square Bi layers in AMnBi2 (A= Sr, Ca) host Dirac fermions which coexist with antiferromagnetic order on the Mn sublattice below TN=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 s...

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Publication status:
Published
Peer review status:
Peer reviewed
Version:
Accepted Manuscript

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Publisher copy:
10.1103/PhysRevB.95.134405

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Department:
Oxford, MPLS, Physics, Condensed Matter Physics
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Department:
Oxford, MPLS, Physics, Condensed Matter Physics
Piovano, A More by this author
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Funding agency for:
Rahn, MC
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Grant:
Strategic Priority Research Program (B) XDB07020100
Publisher:
American Physical Society Publisher's website
Journal:
Physical Review B Journal website
Volume:
95
Issue:
13
Pages:
Article: 134405
Publication date:
2017-04-05
Acceptance date:
2017-03-08
DOI:
EISSN:
2469-9969
ISSN:
2469-9950
Pubs id:
pubs:690885
URN:
uri:aa589011-c7b0-4fd1-a12e-0d86a1fce023
UUID:
uuid:aa589011-c7b0-4fd1-a12e-0d86a1fce023
Local pid:
pubs:690885

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