August 30, 2021 to September 3, 2021
University of Innsbruck
Europe/Zurich timezone

【170】Evolution of Electron-Phonon Coupling across the Metal-Insulator Transition of Rare-Earth Nickelates

Sep 3, 2021, 1:30 PM
Room C

Room C

Talk Condensed Matter Physics (KOND) Condensed Matter Physics


Teguh Citra Asmara (Paul Scherrer Institute)


Rare-earth nickelates, RNiO$_{3}$, are negative charge-transfer materials with electronic configuration of Ni-3$d^8\underline{L}$ ($\underline{L}$ = oxygen ligand hole) in their metallic state. Most RNiO$_{3}$ undergo low-temperature metal-to-insulator transition (MIT) accompanied by breathing distortion in their crystal structure, where neighboring expanded NiO$_{6}$ octahedra (Ni-3$d^8$ configuration) alternate with collapsed NiO$_{6}$ (Ni-3$d^8\underline{L}^{2}$). Here, using resonant inelastic x-ray scattering, we reveal that the electron-phonon coupling (EPC) of the breathing-mode phonon significantly increases as NdNiO$_{3}$ undergoes MIT. Meanwhile, no significant changes are observed in the EPC of LaNiO$_{3}$ (SmNiO$_{3}$), which stays metallic (insulating) at all studied temperatures. These results confirm the major role that the breathing distortion and its EPC play in the MIT of RNiO$_{3}$.

Primary authors

Teguh Citra Asmara (Paul Scherrer Institute) Claribel Dominguez (University of Geneva) Wenliang Zhang (Paul Scherrer Institut) Dr Jennifer Fowlie (University of Geneva) Yi Tseng (Paul Scherrer Institut) Eugenio Paris (PSI - Paul Scherrer Institut) Jonathan Pelliciari (MIT) Dr Andi Barbour (Brookhaven National Laboratory) Dr Ignace Jarrige (Brookhaven National Laboratory) Dr Steven Johnston (University of Tennessee) Prof. Marta Gibert (University of Zurich) Dr Valentina Bisogni (Brookhaven National Laboratory) Dr Jean-Marc Triscone (University of Geneva) Thorsten Schmitt (Swiss Light Source, Paul Scherrer Institut)

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