ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr 2 IrO 4 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2019

ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr 2 IrO 4

Résumé

Sr2IrO4 is characterized by a large spin-orbit coupling, which gives rise to bands with strongly entangled spin and orbital characters, called J1/2 and J3/2. We use light-polarization dependent ARPES to study directly the orbital character of these bands and fully map out their dispersion. We observe bands in very good agreement with our cluster dynamical mean-field theory calculations. We show that the J1/2 band, the closest to the Fermi level EF , is dominated by dxz character along kx and dyz along ky. This is actually in agreement with an isotropic J1/2 character on average, but this large orbital dependence in k-space was mostly overlooked before. It gives rise to strong modulations of the ARPES intensity that we explain and carefully take into account to compare dispersions in equivalent directions of the Brillouin zone. Although the latter dispersions look different at first, suggesting possible symmetry breakings, they are found essentially similar, once corrected for these intensity variations. In articular, the pseudogap-like features close to the X point appearing in the nearly metallic 15% Rh-doped Sr2IrO4 strongly depend on experimental conditions. We reveal that there is nevertheless an energy scale of 30meV below which spectral weight is suppressed, independent of the experimental conditions, which gives a reliable basis to analyze this behavior. We suggest it is caused by disorder.
Fichier principal
Vignette du fichier
1907.01247_LouatPRB19.pdf (3.72 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03086957 , version 1 (23-12-2020)

Identifiants

Citer

Alex Louat, Benjamin Lenz, Silke Biermann, Cyril Martins, François Bertran, et al.. ARPES study of orbital characters, symmetry breakings and pseudogaps in doped and pure Sr 2 IrO 4. Physical Review B, 2019, 100 (20), pp.205135. ⟨10.1103/PhysRevB.100.205135⟩. ⟨hal-03086957⟩
362 Consultations
93 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More