First-Order Melting of a Weak Spin-Orbit Mott Insulator into a Correlated Metal.
Phys Rev Lett
; 114(25): 257203, 2015 Jun 26.
Article
em En
| MEDLINE
| ID: mdl-26197142
ABSTRACT
The electronic phase diagram of the weak spin-orbit Mott insulator (Sr(1-x)La(x))(3)Ir(2)O(7) 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≈0.04. Continued electron doping results in an abrupt, first-order phase boundary where the Néel 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.
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MEDLINE
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En
Ano de publicação:
2015
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Article