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

De la Torre, A; McKeown Walker, S; Bruno, FY; Riccó, S; Wang, Z; Gutierrez Lezama, I; Scheerer, G; ... Baumberger, F; + view all (2015) Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr2IrO4. Physical Review Letters , 115 (17) , Article 176402. 10.1103/PhysRevLett.115.176402. Green open access

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Abstract

We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet (Sr1−xLax)2IrO4. For a doping level of x=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 (π,π) reciprocal lattice vector which we attribute to the intrinsic structural distortion of Sr2IrO4.

Type: Article
Title: Collapse of the Mott Gap and Emergence of a Nodal Liquid in Lightly Doped Sr2IrO4
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.115.176402
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.115.176402
Language: English
Additional information: Copyright © 2015 American Physical Society.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1483848
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