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Article Dans Une Revue Physical Review B Année : 2020

Direct evidence for anisotropic three-dimensional magnetic excitations in a hole-doped antiferromagnet

Résumé

We report a neutron-scattering study on Pr2−xSrxNiO4 (x≈0.5) with magnetic incommensurability ε=0.461 at 10 K, showing direct evidence for out-of-plane magnetic excitations caused by a non-negligible interlayer spin coupling (J⊥). The magnetic spectrum is fully represented by linear spin wave theory considering an unconventional body-centered-like stacking of discommensurated spin stripes. A large easy-plane-type single-ion anisotropy (≈1.5 meV) has been found to be responsible for a finite-energy (≈13 meV) Goldstone mode at the magnetic zone center. Our results validate the presence of a sizable out-of-plane interaction resulting in an anisotropic three-dimensional nature of spin dynamics in Pr2−xSrxNiO4 near the half-doped region.
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Dates et versions

hal-02972586 , version 1 (20-10-2020)

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Rajesh Dutta, Avishek Maity, Anna Marsicano, J. Ross Stewart, Matthias Opel, et al.. Direct evidence for anisotropic three-dimensional magnetic excitations in a hole-doped antiferromagnet. Physical Review B, 2020, 102 (16), ⟨10.1103/PhysRevB.102.165130⟩. ⟨hal-02972586⟩
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