Classical and cubic Rashba effect in the presence of in-plane 4f magnetism at the iridium silicide surface of the antiferromagnet GdIr2Si2

We present a combined experimental and theoretical study of the two-dimensional electron states at the iridium-silicide surface of the antiferromagnet GdIr2Si2 above and below the Néel temperature. Using angle-resolved photoemission spectroscopy (ARPES) we find a significant spin-orbit splitting of the surface states in the paramagnetic phase. By means of ab initio density-functional-theory (DFT) calculations we establish that the surface electron states that reside in the projected band gap around the M¯ point exhibit very different spin structures which are governed by the conventional and the cubic Rashba effect. The latter is reflected in a triple spin winding, i.e., the surface electron spin reveals three complete rotations upon moving once around the constant energy contours. Below the Néel temperature, our ARPES measurements show an intricate photoemission intensity picture characteristic of a complex magnetic domain structure. The orientation of the domains, however, can be clarified from a comparative analysis of the ARPES data and their DFT modeling. To characterize a single magnetic domain picture, we resort to the calculations and scrutinize the interplay of the Rashba spin-orbit coupling field with the in-plane exchange field, provided by the ferromagnetically ordered 4f moments of the near-surface Gd layer.

Vyazovskaya, A. YuTomsk State University,Saint Petersburg State University (författare)
Poelchen, G.Dresden University of Technology,European Synchrotron Radiation Facility (författare)
Generalov, A.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-arg (författare)
Güttler, M.Dresden University of Technology (författare)
Mende, M.Dresden University of Technology (författare)
Danzenbächer, S.Dresden University of Technology (författare)
Otrokov, M. M.Basque Foundation for Science,CSIC Centro de Física de Materiales (UPV/EHU) (författare)
Balasubramanian, T.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)maxl-bth (författare)
Polley, C.Lund University,Lunds universitet,MAX IV-laboratoriet,MAX IV Laboratory(Swepub:lu)cr4837po (författare)
Chulkov, E. V.CSIC Centro de Física de Materiales (UPV/EHU),Donostia International Physics Center (DIPC),University of the Basque Country,Saint Petersburg State University,Tomsk State University (författare)
Laubschat, C.Dresden University of Technology (författare)
Peters, M.Goethe University (författare)
Kliemt, K.Goethe University (författare)
Krellner, C.Goethe University (författare)
Usachov, D. YuSaint Petersburg State University (författare)
Vyalikh, D. V.Donostia International Physics Center (DIPC),Basque Foundation for Science (författare)
Dresden University of TechnologyTomsk State University (creator_code:org_t)

Av författaren/redakt...: Schulz, S.; Vyazovskaya, A. ...; Poelchen, G.; Generalov, A.; Güttler, M.; Mende, M.; visa fler...; Danzenbächer, S.; Otrokov, M. M.; Balasubramanian, ...; Polley, C.; Chulkov, E. V.; Laubschat, C.; Peters, M.; Kliemt, K.; Krellner, C.; Usachov, D. Yu; Vyalikh, D. V.; visa färre...

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