Crossover from diffusive to superfluid transport in frustrated magnets

Abstract
We investigate the spin transport across the magnetic phase diagram of a frustrated antiferromagnetic insulator and uncover a drastic modification of the transport regime from spin diffusion to spin superfluidity. Adopting a triangular lattice accounting for both nearest-neighbor and next-nearest-neighbor exchange interactions with easy-plane anisotropy, we perform atomistic spin simulations on a two-terminal configuration across the full magnetic phase diagram. We found that as long as the ground state magnetic moments remain in-plane, irrespective of whether the magnetic configuration is ferromagnetic, collinear, or noncollinear antiferromagnetic, the system exhibits spin superfluid behavior with a device output that is independent of the value of the exchange interactions. When the magnetic frustration is large enough to compete with the easy-plane anisotropy and cant the magnetic moments out of the plane, the spin transport progressively evolves towards the diffusive regime. The robustness of spin superfluidity close to magnetic phase boundaries is investigated and we uncover the possibility for proximate spin superfluidity close to the ferromagnetic transition.

Citation
Goli, V. M. L. D. P., & Manchon, A. (2021). Crossover from diffusive to superfluid transport in frustrated magnets. Physical Review B, 103(10). doi:10.1103/physrevb.103.104425

Publisher
American Physical Society (APS)

Journal
Physical Review B

DOI
10.1103/physrevb.103.104425

arXiv
2005.13481

Additional Links
https://link.aps.org/doi/10.1103/PhysRevB.103.104425

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