https://doi.org/10.1140/epjb/s10051-023-00512-3
Regular Article - Solid State and Materials
Evolution of the spectral lineshape at the magnetic transition in Sr
IrO
and Sr
IrO
1
Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405, Orsay, France
2
Université Paris-Saclay, CEA, CNRS, SPEC, 91191, Gif-sur-Yvette, France
3
Departamento de Física, FCEN, UBA, and IFIBA, CONICET, Pabellón 1, Ciudad Universitaria, 1428, Buenos Aires, Argentina
4
Université Paris-Saclay, CEA, CNRS, NIMBE, 91191, Gif-sur-Yvette, France
5
Synchrotron SOLEIL, L’Orme des Merisiers, Saint-Aubin-BP 48, 91192, Gif-sur-Yvette, France
m
veronique.brouet@universite-paris-saclay.fr
Received:
24
January
2023
Accepted:
25
March
2023
Published online:
5
April
2023
SrIrO and SrIrO form two families of spin-orbit Mott insulators with quite different charge gaps and an antiferromagnetic (AF) ground state. This offers a unique opportunity to study the impact of long-range magnetic order in Mott insulators. It appears to play a different role in the two families, as there is almost no change of the resistivity at the magnetic transition 
in SrIrO and a large one in SrIrO. We use angle-resolved photoemission to study the evolution of the spectral lineshape through the magnetic transition. We use Ru and La substitutions to tune and discriminate changes due to temperature from those due to magnetic order. We evidence a shift and a transfer of spectral weight in the gap at in SrIrO, which is absent in SrIrO. We assign this behavior to a significantly larger coherent contribution to the spectral lineshape in SrIrO, which evolves strongly at . On the contrary, the SrIrO lineshape is dominated by the incoherent part, which is insensitive to . We compare these findings to theoretical expectations of the Slater vs Mott antiferromagnetism within dynamical mean field theory.
Supplementary Information The online version contains supplementary material available at https://doi.org/10.1140/epjb/s10051-023-00512-3.
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