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Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr2IrO4

DOI: 10.1103/PhysRevLett.115.176402 DOI Help
PMID: 26551128 PMID Help

Authors: A De La Torre (University of Geneva) , S. Mckeown Walker (University of Geneva) , F. Y. Bruno (University of Geneva) , S. Riccó (University of Geneva) , Z. Wang (Swiss Light Source) , I. Gutierrez Lezama (University of Geneva) , G. Scheerer (University of Geneva) , G. Giriat (University of Geneva) , D. Jaccard (University of Geneva) , C. Berthod (University of Geneva) , T. K. Kim (Diamond Light Source) , M Hoesch (Diamond Light Source) , E. C. Hunter (The University of Edinburgh) , R. S. Perry (University College London) , A. Tamai (University of Geneva) , F. Baumberger (University of Geneva)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 115 (17)

State: Published (Approved)
Published: October 2015
Diamond Proposal Number(s): 10348

Abstract: We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet ðSr1−xLaxÞ 2IrO4. For a doping level of x ¼ 0.05, we find an unusual metallic state with coherent nodal excitations and an antinodal pseudogap bearing strong similarities with underdoped cuprates. This state emerges from a rapid collapse of the Mott gap with doping resulting in a large underlying Fermi surface that is backfolded by a ðπ; πÞ reciprocal lattice vector which we attribute to the intrinsic structural distortion of Sr2IrO4.

Subject Areas: Physics


Instruments: I05-ARPES