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- Title
Electron-polaron dichotomy of charge carriers in perovskite oxides.
- Authors
Husanu, M.-A.; Vistoli, L.; Verdi, C.; Sander, A.; Garcia, V.; Rault, J.; Bisti, F.; Lev, L. L.; Schmitt, T.; Giustino, F.; Mishchenko, A. S.; Bibes, M.; Strocov, V. N.
- Abstract
Many transition metal oxides (TMOs) are Mott insulators due to strong Coulomb repulsion between electrons, and exhibit metal-insulator transitions (MITs) whose mechanisms are not always fully understood. Unlike most TMOs, minute doping in CaMnO3 induces a metallic state without any structural transformations. This material is thus an ideal platform to explore band formation through the MIT. Here, we use angle-resolved photoemission spectroscopy to visualize how electrons delocalize and couple to phonons in CaMnO3. We show the development of a Fermi surface where mobile electrons coexist with heavier carriers, strongly coupled polarons. The latter originate from a boost of the electron-phonon interaction (EPI). This finding brings to light the role that the EPI can play in MITs even caused by purely electronic mechanisms. Our discovery of the EPI-induced dichotomy of the charge carriers explains the transport response of Ce-doped CaMnO3 and suggests strategies to engineer quantum matter from TMOs. The underlying mechanisms of the metal-insulator transition in correlated oxides are a rich source of interesting physics and a topic of long-standing investigation. Here, the authors use angle-resolved photoelectron spectroscopy to investigate changes in charge carrier properties and electron-phonon interactions as a function of Ce-doping across the metal-insulator transition in CaMnO3.
- Subjects
TRANSITION metal oxides; METAL-insulator transitions; ELECTRON-phonon interactions; PHOTOELECTRON spectroscopy; FERMI surfaces
- Publication
Communications Physics, 2020, Vol 3, Issue 1, p1
- ISSN
2399-3650
- Publication type
Article
- DOI
10.1038/s42005-020-0330-6