Single crystal neutron scattering definitively reveals antiferromagnetic spin stripes that are commensurate with and strongly coupled to charge stripes at a semiconductor-insulator transition in La4Ni3O8.
Significance and Impact
Understanding the coupling between charge and spin is key in the exploration of potential high-TC physics in copper-free oxides.
- Both polarized and unpolarized single crystal neutron diffraction, were performed on La4Ni3O8 with triple-axis instruments at HFIR and NIST Center for Neutron Research.
- The semiconductor to insulator transition is accompanied by simultaneous charge and antiferromagnetic spin stripe order that occurs within square planar, Ni-O trilayers.
- Both experiment and density functional theory calculations indicate that spins point along the c‑axis, in contrast to cuprates.
- The spin and charge stripe order parameters are strongly coupled; uniquely, neither order parameter is secondary to the other.
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