Journal Article

PUBDB-2019-05610

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png In situ strain tuning of the metal-insulator-transition of $Ca_{2}RuO_{4}$ in angle-resolved photoemission experiments

Riccò, S. ; Kim, M. ; Tamai, A. ; McKeown Walker, S. ; Bruno, F. Y. ; Cucchi, I. ; Cappelli, E. ; Besnard, C. ; Kim, T. K. ; Dudin, P. ; Hoesch, M.DESY* ; Gutmann, M. J. ; Georges, A. ; Perry, R. S. ; Baumberger, F.

2018
Nature Publishing Group UK [London]

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Please use a persistent id in citations: doi:10.1038/s41467-018-06945-0  doi:10.3204/PUBDB-2019-05610

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.

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Contributing Institute(s):

1. Experimentebetreuung PETRA III (FS-PE)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)

Experiment(s):

1. Measurement at external facility

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