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Anomalous band renormalization due to a high-energy kink in K0.65RhO2 with colossal thermoelectric power factor

Changdar, S and Shipunov, G and Joseph, NB and Plumb, NC and Shi, M and Büchner, B and Narayan, A and Aswartham, S and Thirupathaiah, S (2021) Anomalous band renormalization due to a high-energy kink in K0.65RhO2 with colossal thermoelectric power factor. In: Physical Review Materials, 5 (5).

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Official URL: https://doi.org/10.1103/PhysRevMaterials.5.055402


We identify highly correlated hole pocket on the Fermi surface of colossal thermoelectric material K0.65RhO2, studied using high-resolution angle-resolved photoemission spectroscopy (ARPES) and density-functional theory (DFT) calculations. Most importantly, two kinks at binding energies of 75 and 195 meV have been observed below the Fermi level. While the low-energy kink at 75 meV can be understood as a result of the electron-phonon interaction, the high-energy kink at 195 meV is a discovery of this system, leading to anomalous band renormalization, possibly originated from the bosonic excitations at higher frequencies. We further notice that the high-energy anomaly has important implications on the colossal thermoelectric power of K0.65RhO2.

Item Type: Journal Article
Publication: Physical Review Materials
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the Authors.
Keywords: Binding energy; Density functional theory; Electric power factor; Electron-phonon interactions; Photoelectron spectroscopy; Rhodium compounds; Thermoelectric power; Thermoelectric power plants, Anomalous bands; Bosonic excitations; High-resolution angle-resolved photoemission spectroscopies; Higher frequencies; Highly-correlated; Renormalization; Thermo-Electric materials; Thermoelectric power factors, Potassium compounds
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 16 May 2023 09:48
Last Modified: 16 May 2023 09:48
URI: https://eprints.iisc.ac.in/id/eprint/81686

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