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Article Abstract
Charge ordering (CO), characterized by a periodic modulation of electron density and lattice distortion, has been a fundamental topic in condensed matter physics, serving as a potential platform for inducing novel functional properties. The charge-ordered phase is known to occur in a doped system with high d-electron occupancy, rather than low occupancy. Here, we report the realization of the charge-ordered phase in electron-doped (100) SrTiO epitaxial thin films that have the lowest d-electron occupancy i.e., d-d. Theoretical calculation predicts the presence of a metastable CO state in the bulk state of electron-doped SrTiO. Atomic scale analysis reveals that (100) surface distortion favors electron-lattice coupling for the charge-ordered state, and triggering the stabilization of the CO phase from a correlated metal state. This stabilization extends up to six unit cells from the top surface to the interior. Our approach offers an insight into the means of stabilizing a new phase of matter, extending CO phase to the lowest electron occupancy and encompassing a wide range of 3d transition metal oxides.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10853244 | PMC |
| http://dx.doi.org/10.1038/s41467-024-45342-8 | DOI Listing |
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