Abstract
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.
| Original language | English |
|---|---|
| Article number | 165130 |
| Journal | Physical Review B |
| Volume | 102 |
| Issue number | 16 |
| DOIs | |
| State | Published - Oct 2020 |
| Externally published | Yes |
Funding
A. Maity would like to greatly acknowledge the support of G. Eckold for giving the opportunity to use internal neutron beamtime at the instrument PUMA, FRM II, operated by Georg-August-Universität Göttingen in cooperation with Technische Universität München. R.D., A. Maity, and A. Marsicano would like to thank M. Ceretti for her kind support in the single crystal growth. R.D and A. Maity would like to acknowledge the financial support of Institut für Kristallographie, RWTH Aachen Universität, and Technische Universität München, respectively, for performing the experiments at MAPS, ISIS.