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Electronic structure of Ca$_{1-x}$Sr$_x$VO$_3$: a tale of two energy-scales

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arxiv cond-mat/0105424 v1 pith:NIC25JHG submitted 2001-05-22 cond-mat.str-el

K. Maiti , D.D. Sarma , M.J. Rozenberg , I.H. Inoue , H. Makino , O. Goto , M. Pedio , R. Cimino This is my paper
classification cond-mat.str-el
keywords electronicstructuresurfacebulkenergy-scalesphotoemissionrelatedspectra
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abstract

We investigate the electronic structure of Ca$_{1-x}$Sr$_x$VO$_3$ using photoemission spectroscopy. Core level spectra establish an electronic phase separation at the surface, leading to distinctly different surface electronic structure compared to the bulk. Analysis of the photoemission spectra of this system allowed us to separate the surface and bulk contributions. These results help us to understand properties related to two vastly differing energy-scales, namely the low energy-scale of thermal excitations (~$k_{B}T$) and the high-energy scale related to Coulomb and other electronic interactions.

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