Magnetic structure and excitations of the topological semimetal YbMnBi2

TY - JOUR

T1 - Magnetic structure and excitations of the topological semimetal YbMnBi2

AU - Soh, Jian-Rui

AU - Jacobsen, Henrik

AU - Ouladdiaf, Bachir

AU - Ivanov, Alexandre

AU - Piovano, Andrea

AU - Tejsner, Tim

AU - Feng, Zili

AU - Wang, Hongyuan

AU - Su, Hao

AU - Guo, Yanfeng

AU - Shi, Youguo

AU - Boothroyd, Andrew T.

PY - 2019/10/22

Y1 - 2019/10/22

N2 - We investigated the magnetic structure and dynamics of YbMnBi2, with elastic and inelastic neutron scattering, to shed light on the topological nature of the charge carriers in the antiferromagnetic phase. We confirm C-type antiferromagnetic ordering of the Mn spins below TN=290K and determine that the spins point along the c axis to within about 3. The observed magnon spectrum can be described very well by the same effective spin Hamiltonian that was used previously to model the magnon spectrum of CaMnBi2. Our results show conclusively that the creation of Weyl nodes in YbMnBi2 by the time-reversal symmetry-breaking mechanism can be excluded in the bulk.

AB - We investigated the magnetic structure and dynamics of YbMnBi2, with elastic and inelastic neutron scattering, to shed light on the topological nature of the charge carriers in the antiferromagnetic phase. We confirm C-type antiferromagnetic ordering of the Mn spins below TN=290K and determine that the spins point along the c axis to within about 3. The observed magnon spectrum can be described very well by the same effective spin Hamiltonian that was used previously to model the magnon spectrum of CaMnBi2. Our results show conclusively that the creation of Weyl nodes in YbMnBi2 by the time-reversal symmetry-breaking mechanism can be excluded in the bulk.

U2 - 10.1103/PhysRevB.100.144431

DO - 10.1103/PhysRevB.100.144431

M3 - Journal article

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 14

M1 - 144431

ER -