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Instruments / Technical Area	Publication Details	Published	Actions
I09-Surface and Interface Structural Analysis	Evidence of magnetism-induced topological protection in the axion insulator candidate EuSn2P2 Gian Marco Pierantozzi , Alessandro De Vita , Chiara Bigi , Xin Gui , Hung-Ju Tien , Debashis Mondal , Federico Mazzola , Jun Fujii , Ivana Vobornik , Giovanni Vinai , Alessandro Sala , Cristina Africh , Tien-Lin Lee , Giorgio Rossi , Tay-Rong Chang , Weiwei Xie , Robert J. Cava , Giancarlo Panaccione Proceedings Of The National Academy Of Sciences 119 DOI: 10.1073/pnas.2116575119 Diamond Proposal Number(s): [24968] Open Access Show Abstract ▼ Abstract: We unravel the interplay of topological properties and the layered (anti)ferromagnetic ordering in EuSn2P2, using spin and chemical selective electron and X-ray spectroscopies supported by first-principle calculations. We reveal the presence of in-plane long-range ferromagnetic order triggering topological invariants and resulting in the multiple protection of topological Dirac states. We provide clear evidence that layer-dependent spin-momentum locking coexists with ferromagnetism in this material, a cohabitation that promotes EuSn2P2 as a prime candidate axion insulator for topological antiferromagnetic spintronics applications.	Jan 2022

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