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25 April 2024

» arxiv » cond-mat/0606192

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Evidence for mass renormalization in LaNiO$"" sub 3_: an in situ soft x-ray photoemission study of epitaxial films
K. Horiba ; R. Eguchi ; M. Taguchi ; A. Chainani ; A. Kikkawa ; Y. Senba ; H. Ohashi ; S. Shin ;
Date:	7 Jun 2006
Subject:	Strongly Correlated Electrons
Abstract:	We investigate the electronic structure of high-quality single-crystal LaNiO$_3$ (LNO) thin films using in situ photoemission spectroscopy (PES). The in situ high-resolution soft x-ray PES measurements on epitaxial thin films reveal the intrinsic electronic structure of LNO. We find a new sharp feature in the PES spectra crossing the Fermi level, which is derived from the correlated Ni 3$d$ $e_g$ electrons. This feature shows significant enhancement of spectral weight with decreasing temperature. From a detailed analysis of resistivity data, the enhancement of spectral weight is attributed to increasing electron correlations due to antiferromagnetic fluctuations.
Source:	arXiv, cond-mat/0606192
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