Coherent and incoherent bands in La and Rh doped Sr$_3$ Ir$_2$ O$_7$ - CEA - Commissariat à l’énergie atomique et aux énergies alternatives Accéder directement au contenu
Article Dans Une Revue Physical Review B Année : 2018

Coherent and incoherent bands in La and Rh doped Sr$_3$ Ir$_2$ O$_7$

L. Fruchter
F. Bertran
P. Le Fèvre
J. Rault
Dorothée Colson
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Résumé

In Sr$_2$ IrO$_4$ and Sr$_3$ Ir$_2$ O$_7$ , correlations, magnetism, and spin-orbit coupling compete on similar energy scales, creating a new context to study metal-insulator transitions (MIT). We use here angle-resolved photoemission to investigate the MIT as a function of hole and electron doping in Sr$_3$ Ir$_2$ O$_7$ , obtained respectively by Ir/Rh and Sr/La substitutions. We show that there is a clear reduction as a function of doping of the gap between a lower and upper band on both sides of the Fermi level, from 0.2 to 0.05 eV. Although these two bands have a counterpart in band structure calculations, they are characterized by a very different degree of coherence. The upper band exhibits clear quasiparticle peaks, while the lower band is very broad and loses weight as a function of doping. Moreover, their ARPES spectral weights obey different periodicities, reinforcing the idea of their different nature. We argue that a very similar situation occurs in Sr$_2$ IrO$_4$ and conclude that the physics of the two families is essentially the same.
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Dates et versions

cea-02086414 , version 1 (01-04-2019)

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V. Brouet, L. Serrier-Garcia, A. Louat, L. Fruchter, F. Bertran, et al.. Coherent and incoherent bands in La and Rh doped Sr$_3$ Ir$_2$ O$_7$. Physical Review B, 2018, 98, pp.235101. ⟨10.1103/PhysRevB.98.235101⟩. ⟨cea-02086414⟩
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