Incommensurate magnetic orders and topological Hall effect in the square-net centrosymmetric EuGa2Al2 system

Jaime M. Moya, Shiming Lei, Eleanor M. Clements, Caitlin S. Kengle, Stella Sun, Kevin Allen, Qizhi Li, Y. Y. Peng, Ali A. Husain, Matteo Mitrano, Matthew J. Krogstad, Raymond Osborn, Anand B. Puthirath, Songxue Chi, L. Debeer-Schmitt, J. Gaudet, P. Abbamonte, Jeffrey W. Lynn, E. Morosan

Research output: Contribution to journalArticlepeer-review

Abstract

Neutron diffraction on the centrosymmetric square-net magnet EuGa2Al2 reveals multiple incommensurate magnetic states (AFM1, 2, 3) in zero field. In applied field, a new magnetic phase (A) is identified from magnetization and transport measurements, bounded by two of the μ0H=0 incommensurate magnetic phases (AFM1, helical, and AFM3, cycloidal) with different moment orientations. Moreover, magnetotransport measurements indicate the presence of a topological Hall effect, with maximum values centered in the A phase. Together, these results render EuGa2Al2 a material with noncoplanar or topological spin texture in applied field. X-ray diffraction reveals an out-of-plane (OOP) charge density wave (CDW) below TCDW∼50 K while the magnetic propagation vector lies in plane below TN=19.5 K. Together these data point to a new route to realizing in-plane noncollinear spin textures through an OOP CDW. In turn, these noncollinear spin textures may be unstable against the formation of topological spin textures in an applied field.

Original languageEnglish (US)
Article number074201
JournalPhysical Review Materials
Volume6
Issue number7
DOIs
StatePublished - Jul 2022

ASJC Scopus subject areas

  • General Materials Science
  • Physics and Astronomy (miscellaneous)

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