Signatures of canted antiferromagnetism in infinite-layer nickelates studied by x-ray magnetic dichroism
Résumé
We report an experimental study of the magnetic properties of infinite-layer Nd1-xSrxNiO2 (x = 0 and 0.2) thin films by x-ray magnetic circular dichroism (XMCD) at Ni L3,2-and Nd M5,4edges. We show the presence of a field induced out-of-plane Ni 1+ spin-moment, reaching values of 0.25 µB/N i at 9 T in the case of superconducting Nd0.8Sr0.2NiO2. The magnetic field and temperature dependencies of the Ni L3,2 XMCD data can be explained by an out-of-plane canting of in-plane anti-ferromagnetically correlated Ni 1+ spins. The canting is most likely attributed to the symmetry lowering of the NiO2 planes, observed via four-dimensional scanning transmission electron microscopy, which can trigger a Dzyaloshinskii-Moriya interaction among the Ni 1+ spins.
Domaines
Physique [physics]| Origine | Fichiers produits par l'(les) auteur(s) |
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