First-Order Melting of a Weak Spin-Orbit Mott Insulator into a Correlated Metal

被引：44

作者：

Hogan, Tom ^{[1
,2
]}

Yamani, Z. ^{[3
]}

Walkup, D. ^{[1
]}

Chen, Xiang ^{[1
,2
]}

Dally, Rebecca ^{[1
,2
]}

Ward, Thomas Z. ^{[4
]}

Dean, M. P. M. ^{[5
]}

Hill, John ^{[5
]}

Islam, Z. ^{[6
]}

Madhavan, Vidya ^{[7
,8
]}

Wilson, Stephen D. ^{[2
]}

机构：

[1] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA

[2] Univ Calif Santa Barbara, Dept Mat, Santa Barbara, CA 93106 USA

[3] CNR, Canadian Neutron Beam Ctr, Chalk River, ON K0J 1P0, Canada

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

[5] Brookhaven Natl Lab, Dept Condensed Matter Phys & Mat Sci, Upton, NY 11973 USA

[6] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[7] Univ Illinois, Dept Phys, Urbana, IL 61801 USA

[8] Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 114卷 / 25期

基金：

美国国家科学基金会;

关键词：

STATE; PHASE;

D O I：

10.1103/PhysRevLett.114.257203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The electronic phase diagram of the weak spin-orbit Mott insulator (Sr1-xLax)(3)Ir2O7 is determined via an exhaustive experimental study. Upon doping electrons via La substitution, an immediate collapse in resistivity occurs along with a narrow regime of nanoscale phase separation comprised of antiferromagnetic, insulating regions and paramagnetic, metallic puddles persisting until x approximate to 0.04. Continued electron doping results in an abrupt, first-order phase boundary where the Neel state is suppressed and a homogenous, correlated, metallic state appears with an enhanced spin susceptibility and local moments. As the metallic state is stabilized, a weak structural distortion develops and suggests a competing instability with the parent spin-orbit Mott state.

引用

页数：5

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