Evolution of the spectral lineshape at the magnetic transition in Sr 2 IrO 4 and Sr 3 Ir 2 O 7 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue The European Physical Journal B: Condensed Matter and Complex Systems Année : 2023

Evolution of the spectral lineshape at the magnetic transition in Sr 2 IrO 4 and Sr 3 Ir 2 O 7

Résumé

Sr2IrO4 and Sr3Ir2O7 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 TN in Sr2IrO4 and a large one in Sr3Ir2O7. 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 TN 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 TN in Sr3Ir2O7, which is absent in Sr2IrO4. We assign this behavior to a significantly larger coherent contribution to the spectral lineshape in Sr3Ir2O7, which evolves strongly at TN. On the contrary, the Sr2IrO4 lineshape is dominated by the incoherent part, which is insensitive to TN. We compare these findings to theoretical expections of the Slater vs Mott antiferromagnetism within Dynamical Mean Field Theory.
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Dates et versions

hal-04272746 , version 1 (06-11-2023)

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Paul Foulquier, Marcello Civelli, Marcelo Rozenberg, Alberto Camjayi, Joel Bobadilla, et al.. Evolution of the spectral lineshape at the magnetic transition in Sr 2 IrO 4 and Sr 3 Ir 2 O 7. The European Physical Journal B: Condensed Matter and Complex Systems, 2023, 96 (4), pp.42. ⟨10.1140/epjb/s10051-023-00512-3⟩. ⟨hal-04272746⟩
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