Optical probe of strong correlations in LaNiO$_{3} $ thin films

Details Optical probe of strong correlations in LaNiO$_{3} $ thin films Optical probe of strong correlations in LaNiO$_{3} $ thin films

2010-05-18

arxiv.org/abs/1005.3314v1

J. of Appl. Phys. 110, 033514 (2011)

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1063/1.3614019

The optical properties of LaNiO$_3$ thin films are investigated over a wide energy and temperature range. Thin films of varying thickness were epitaxially grown by pulsed laser deposition on LaAlO$_3$ and SrTiO$_3$ substrates. The optical conductivity data of the films reveal a number of interband transitions above 1 eV which are in good agreement with band structure calculations. No well defined Drude peak is observed however, in stark contrast with LDA theory predicting a finite density of states at the Fermi energy. This experimental finding of a vanishing Drude spectral weight, compared to a finite electron kinetic energy obtained from band structure calculations, highlights the importance of strong electronic correlations in LaNiO$_3$.

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