Details

Autor(en) / Beteiligte

• Hu, Xiao
• Sapkota, Aashish
• Hu, Zhixiang
• Savici, Andrei T.
• Kolesnikov, Alexander I.
• Tranquada, John M.
• Petrovic, Cedomir
• Zaliznyak, Igor A.

Titel

Coupling of magnetism and Dirac fermions in YbMnSb2

Ist Teil von

• Physical review. B, 2023-05, Vol.107 (20)

Ort / Verlag

United States: American Physical Society (APS)

Erscheinungsjahr

2023

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• Here, we report inelastic neutron scattering measurements of magnetic excitations in YbMnSb2, a low-carrier-density Dirac semimetal in which the antiferromagnetic Mn layers are interleaved with Sb layers that host Dirac fermions. We observe a measurable broadening of spin waves, which is consistent with substantial spin-fermion coupling. The spin-wave damping γ in YbMnSb2 is roughly twice larger compared to that in a sister material, YbMnBi2, where an indication of a small damping consistent with a theoretical analysis of the spin-fermion coupling was reported. The interplane interaction between the Mn layers in YbMnSb2 is also much stronger, suggesting that the interaction mechanism is rooted in the same spin-fermion coupling. Our results establish the systematics of spin-fermion interactions in layered magnetic Dirac materials.