In situ strain tuning of the metal-insulator-transition of Ca2RuO4 in angle-resolved photoemission experiments

S. Riccò, M. Kim, A. Tamai, S. McKeown Walker, F. Y. Bruno, I. Cucchi, E. Cappelli, C. Besnard, T. K. Kim, P. Dudin, M. Hoesch, M. J. Gutmann, A. Georges, R. S. Perry and F. Baumberger ()
Additional contact information
S. Riccò: University of Geneva
M. Kim: Centre de Physique Théorique Ecole Polytechnique, CNRS, Universite Paris-Saclay
A. Tamai: University of Geneva
S. McKeown Walker: University of Geneva
F. Y. Bruno: University of Geneva
I. Cucchi: University of Geneva
E. Cappelli: University of Geneva
C. Besnard: University of Geneva
T. K. Kim: Diamond Light Source, Harwell Campus
P. Dudin: Diamond Light Source, Harwell Campus
M. Hoesch: Diamond Light Source, Harwell Campus
M. J. Gutmann: ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory
A. Georges: University of Geneva
R. S. Perry: London Centre for Nanotechnology and UCL Centre for Materials Discovery, University College London
F. Baumberger: University of Geneva

Nature Communications, 2018, vol. 9, issue 1, 1-7

Abstract: Abstract Pressure plays a key role in the study of quantum materials. Its application in angle resolved photoemission (ARPES) studies, however, has so far been limited. Here, we report the evolution of the k-space electronic structure of bulk Ca2RuO4, lightly doped with Pr, under uniaxial strain. Using ultrathin plate-like crystals, we achieve uniaxial strain levels up to −4.1%, sufficient to suppress the insulating Mott phase and access the previously unexplored electronic structure of the metallic state at low temperature. ARPES experiments performed while tuning the uniaxial strain reveal that metallicity emerges from a marked redistribution of charge within the Ru t2g shell, accompanied by a sudden collapse of the spectral weight in the lower Hubbard band and the emergence of a well-defined Fermi surface which is devoid of pseudogaps. Our results highlight the profound roles of lattice energetics and of the multiorbital nature of Ca2RuO4 in this archetypal Mott transition and open new perspectives for spectroscopic measurements.

Date: 2018
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DOI: 10.1038/s41467-018-06945-0

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