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Article Abstract
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- spin textures, opening exciting opportunities for spin moiré physics. A notable example is EuAgSb, where a spin moiré superlattice (SMS), manifested as a double- spin modulation, induces a superzone gap opening. In this work, we investigate the tunability of this gap by an in-plane magnetic field in EuAgSb 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- phase, regardless of in-plane field orientation. Model calculations attribute this robustness to the stability of the SMS under tilted fields. Our results establish EuAgSb as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.
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