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We have investigated the electronic structure of meta-stable perovskiteCa1-xSrxIrO3 (x = 0, 0.5, and 1) thin films using transport measurements,optical spectroscopy, and first-principles calculations. We artificiallyfabricated the perovskite phase of Ca1-xSrxIrO3, which has a hexagonal or postperovskite crystal structure in bulk form, by growing epitaxial thin films onperovskite GdScO3 substrates using epi-stabilization technique. The transportproperties of the perovskite Ca1-xSrxIrO3 films systematically changed fromnearly insulating (or semi-metallic) for x = 0 to bad metallic for x = 1. Dueto the extended wavefunctions, 5d electrons are usually delocalized. However,the strong spin-orbit coupling in Ca1-xSrxIrO3 results in the formation ofeffective total angular momentum Jeff = 1/2 and 3/2 states, which putsCa1-xSrxIrO3 in the vicinity of a metal-insulator phase boundary. As a result,the electrical properties of the Ca1-xSrxIrO3 films are found to be sensitiveto x and strain.

journal of physics. condensed matter

The electronic structure of epitaxially stabilized 5d perovskite  Ca_{1-x}Sr_xIrO_3 (x = 0, 0.5, and 1) thin films: the role of strong  spin-orbit coupling