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- W2000178237 abstract "Type III ground states of hcp vector antiferromagnets—appropriate to the wurtzite magnetic semiconductors (MS) such as Zn1−xMnxSe —are shown to be classically unstable at long wavelengths. The Hamiltonian includes antiferromagnetic nearest-neighbor (NN) and next-nearest-neighbor (NNN) isotropic exchange (J1,J2), and NN anisotropic Dzyaloshinsky–Moriya exchange (D). The hexagonal symmetry allows Ja1 for NN in planes perpendicular to the c axis to be different from Jc1 for NN between planes. For three-component spins a five-dimensional degenerate manifold of type III ground states is found (Ja1=Jc1, D=0). Their instability is investigated through a continuum formulation of the exchange energy, treating D and ΔJ≡(Ja1−Jc1) as small compared with J1. ΔJ is found to induce a twist of a noncollinear ground state, stabilized by D to zeroth order. By fitting the shift δQ of magnetic peaks seen in neutron scattering experiments on Zn0.45Mn0.55Se the required ΔJ/J1 (∼δQ) is found to be 0.06. This value agrees with estimates of higher order superexchange processes for the two types of pairs." @default.
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- W2000178237 title "Ground states of hcp vector antiferromagnets: Zn1−xMnxSe" @default.
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- W2000178237 doi "https://doi.org/10.1063/1.344623" @default.
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