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Robust Spin-Moiré-Superlattice-Driven Gap Opening in EuAg4Sb2 under in-Plane Magnetic Field
J Green1, Arpit Arora2,3, Madalynn Marshall4
1Department of Physics and Astronomy and California NanoSystems Institute, University of California, Los Angeles, California 90095, United States.
None:
Moiré superlattices introduce new length and energy scales, enabling discoveries, such as unconventional superconductivity, in 2D systems. This concept has recently been extended to bulk materials with multiple-q spin textures, opening exciting opportunities for spin moiré physics. A notable example is EuAg4Sb2, where a spin moiré superlattice (SMS), manifested as a double-q spin modulation, induces a superzone gap opening. In this work, we investigate the tunability of this gap by an in-plane magnetic field in EuAg4Sb2 by using neutron scattering, magnetization, and transport measurements. We reveal a cycloidal ground state and multiple spin-reoriented phases induced by the in-plane field, highlighting the critical role of in-plane components in driving magnetic transitions. Moreover, we demonstrate that a robust gap opening persists in the double-q phase, regardless of in-plane field orientation. Model calculations attribute this robustness to the stability of the SMS under tilted fields. Our results establish EuAg4Sb2 as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.
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