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

被引：145

作者：

de la Torre, A. ^{[1
]}

Walker, S. McKeown ^{[1
]}

Bruno, F. Y. ^{[1
]}

Ricco, S. ^{[1
]}

Wang, Z. ^{[1
,2
]}

Lezama, I. Gutierrez ^{[1
]}

Scheerer, G. ^{[1
]}

Giriat, G. ^{[1
]}

Jaccard, D. ^{[1
]}

Berthod, C. ^{[1
]}

Kim, T. K. ^{[3
]}

Hoesch, M. ^{[3
]}

Hunter, E. C. ^{[4
]}

Perry, R. S. ^{[5
,6
]}

Tamai, A. ^{[1
]}

Baumberger, F. ^{[1
,2
,7
]}

机构：

[1] Univ Geneva, Dept Quantum Matter Phys, CH-1211 Geneva 4, Switzerland

[2] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[3] Diamond Light Source, Didcot OX11 0DE, Oxon, England

[4] Univ Edinburgh, Sch Phys & Astron, Edinburgh EH9 2TT, Midlothian, Scotland

[5] UCL, London Ctr Nanotechnol, London WC1E 6BT, England

[6] UCL, UCL Ctr Mat Discovery, London WC1E 6BT, England

[7] Univ St Andrews, Sch Phys & Astron, SUPA, St Andrews KY16 9SS, Fife, Scotland

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 17期

基金：

瑞士国家科学基金会; 英国工程与自然科学研究理事会;

关键词：

HIGH-T-C; QUASI-PARTICLES; FERMI ARCS; SUPERCONDUCTORS; PSEUDOGAP; CA2-XNAXCUO2CL2; STATE;

D O I：

10.1103/PhysRevLett.115.176402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet (Sr1-xLax)(2)IrO4. 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 (pi, pi) reciprocal lattice vector which we attribute to the intrinsic structural distortion of Sr2IrO4.

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页数：5

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