Dr
Vladimir Strocov
(Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland)
Many perovskite transition metal oxides (TMOs) exhibit metal-insulator transitions whose complex physics is not fully understood. We use soft-X-ray ARPES to visualize how the electrons delocalize and couple to bosonic lattice excitations in CaMnO3 upon its doping with Ce. We show the progressive development of a complex Fermi surface where mobile electrons weakly coupled to lattice coexist with much heavier charge carriers formed by strongly coupled polarons. The latter originate from a boost of electron-phonon interaction (EPI) when the populated bandwidth becomes of the order of phonon energy, breaking down the Migdal theorem and invoking high-order terms of EPI. Our results shed light on the complex transport response of Ce-doped CaMnO3 and suggest strategies to engineer TMO-based quantum matter.
Dr
Marius-Adrian Husanu
(Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland)
Dr
Lorenzo Vistoli
(Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France)
Dr
Carla Verdi
(Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK)
Dr
Anke Sander
(Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France)
Dr
Vincenzo Garcia
(Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France)
Dr
Julian Rault
(Synchrotron SOLEIL, L’Orme des Merisiers Saint-Aubin, BP 48, 91192 Gif-sur-Yvette, France)
Dr
Federico Bisti
(Swiss Light Source, Pauls Scherrer Institute, 5232 Villigen-PSI, Switzerland)
Dr
Leonid L. Lev
(National Research Center “Kurchatov Institute”, 123182 Moscow, Russia)
Dr
Thorsten Schmitt
(Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland)
Prof.
Feliciano Giustino
(Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, UK)
Dr
Andrey Mishchenko
(RIKEN Center for Emergent Matter Science (CEMS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan)
Dr
Manuel Bibes
(Unité Mixte de Physique, CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France)
Dr
Vladimir Strocov
(Swiss Light Source, Paul Scherrer Institute, 5232 Villigen-PSI, Switzerland)
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