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

Schulz, S. ; Vyazovskaya, A. Yu ; Poelchen, G. ; Generalov, A. LU ; Güttler, M. ; Mende, M. ; Danzenbächer, S. ; Otrokov, M. M. ; Balasubramanian, T. LU and Polley, C. LU , et al. (2021) In Physical Review B 103(3).
Abstract

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... (More)

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.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
103
issue
3
article number
035123
publisher
American Physical Society
external identifiers
  • scopus:85100302564
ISSN
2469-9950
DOI
10.1103/PhysRevB.103.035123
language
English
LU publication?
yes
id
afa02fc4-fddc-43a6-b8d6-1944db55fceb
date added to LUP
2021-02-12 10:55:51
date last changed
2022-04-27 00:11:53
@article{afa02fc4-fddc-43a6-b8d6-1944db55fceb,
  abstract     = {{<p>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.</p>}},
  author       = {{Schulz, S. and Vyazovskaya, A. Yu and Poelchen, G. and Generalov, A. and Güttler, M. and Mende, M. and Danzenbächer, S. and Otrokov, M. M. and Balasubramanian, T. and Polley, C. and Chulkov, E. V. and Laubschat, C. and Peters, M. and Kliemt, K. and Krellner, C. and Usachov, D. Yu and Vyalikh, D. V.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  number       = {{3}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Classical and cubic Rashba effect in the presence of in-plane 4f magnetism at the iridium silicide surface of the antiferromagnet GdIr2Si2}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.103.035123}},
  doi          = {{10.1103/PhysRevB.103.035123}},
  volume       = {{103}},
  year         = {{2021}},
}