Robust Spin-Moiré-Superlattice-Driven Gap Opening in EuAg4Sb2under in-Plane Magnetic Field

J. Green; Arpit Arora; Madalynn Marshall; Wanfei Shan; Péter Udvarhelyi; Zachary Morgan; Prineha Narang; Huibo Cao; Ni Ni

doi:10.1021/acs.nanolett.5c02167

Robust Spin-Moiré-Superlattice-Driven Gap Opening in EuAg₄Sb₂under in-Plane Magnetic Field

J. Green
, Arpit Arora
, Madalynn Marshall
, Wanfei Shan
, Péter Udvarhelyi
, Zachary Morgan
, Prineha Narang
, Huibo Cao
, Ni Ni

Single Crystal Diffraction

Research output: Contribution to journal › Article › peer-review

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-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 EuAg₄Sb₂by 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 EuAg₄Sb₂as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.

Original language	English
Pages (from-to)	13723-13729
Number of pages	7
Journal	Nano Letters
Volume	25
Issue number	37
DOIs	https://doi.org/10.1021/acs.nanolett.5c02167
State	Published - Sep 17 2025

Funding

N.N. thanks the useful discussion with Prof. Igor I. Mazin, Prof. Takashi Kurumaji and Prof. Stuart Brown. Experimental work at UCLA was supported by the U.S. Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences under Award Number DE-SC0021117. M.M. and H.C. acknowledge the support from U.S. DOE BES Early Career Award KC0402010 under Contract No. DE-AC05-00OR22725 and the U.S. DOE, Office of Science User Facility operated by the ORNL. A.A., W.S., P.U., and P.N. acknowledge the support by Quantum Science Center, a National Quantum Information Science Center of the U.S. Department of Energy, the Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy, Gordon and Betty Moore Foundation Grant No. 8048, and the John Simon Guggenheim Memorial Foundation (Guggenheim Fellowship).

Keywords

Fermi surface reconstruction
magnetic phase diagram
multiple-qmagnetism
skyrmion lattice
spin moiré superlattice
superzone gap

Access to Document

10.1021/acs.nanolett.5c02167

Cite this

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title = "Robust Spin-Moir{\'e}-Superlattice-Driven Gap Opening in EuAg4Sb2under in-Plane Magnetic Field",

abstract = "Moir{\'e} 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 moir{\'e} physics. A notable example is EuAg4Sb2, where a spin moir{\'e} 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 EuAg4Sb2by 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 EuAg4Sb2as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.",

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AU - Shan, Wanfei

AU - Udvarhelyi, Péter

AU - Morgan, Zachary

AU - Narang, Prineha

AU - Cao, Huibo

AU - Ni, Ni

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N2 - 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 EuAg4Sb2by 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 EuAg4Sb2as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.

AB - 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 EuAg4Sb2by 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 EuAg4Sb2as a tunable platform for exploring the spin-texture-driven superzone gap opening in electronic states.

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