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Sökning: WFRF:(Horiba K)

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  • Horio, M., et al. (författare)
  • Influence of oxygen coordination number on the electronic structure of single-layer La-based cuprates
  • 2023
  • Ingår i: Physical Review B. - 2469-9950. ; 108:3
  • Tidskriftsartikel (refereegranskat)abstract
    • We present an angle-resolved photoemission spectroscopy study of the single-layer T∗-type structured cuprate SmLa1-xSrxCuO4 with unique fivefold pyramidal oxygen coordination. Upon varying oxygen content, T∗-SmLa1-xSrxCuO4 evolved from a Mott-insulating to a metallic state where the Luttinger sum rule breaks down under the assumption of a large holelike Fermi surface. This is in contrast with the known doping evolution of the structural isomer La2-xSrxCuO4 with sixfold octahedral coordination. In addition, quantitatively characterized Fermi surface suggests that the empirical Tc rule for octahedral oxygen-coordination systems does not apply to T∗-SmLa1-xSrxCuO4. The present results highlight unique properties of the T∗-type cuprates possibly rooted in its oxygen coordination, and necessitate thorough investigation with careful evaluation of disorder effects.
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  • Thees, Maximilian, et al. (författare)
  • Imaging the itinerant-to-localized transmutation of electrons across the metal-to-insulator transition in V2O3
  • 2021
  • Ingår i: Science Advances. - : American Association for the Advancement of Science (AAAS). - 2375-2548. ; 7:45
  • Tidskriftsartikel (refereegranskat)abstract
    • In solids, strong repulsion between electrons can inhibit their movement and result in a “Mott” metal-to-insulator transition (MIT), a fundamental phenomenon whose understanding has remained a challenge for over 50 years. A key issue is how the wave-like itinerant electrons change into a localized-like state due to increased interactions. However, observing the MIT in terms of the energy- and momentum-resolved electronic structure of the system, the only direct way to probe both itinerant and localized states, has been elusive. Here we show, using angle-resolved photoemission spectroscopy (ARPES), that in V2O3, the temperature-induced MIT is characterized by the progressive disappearance of its itinerant conduction band, without any change in its energy-momentum dispersion, and the simultaneous shift to larger binding energies of a quasi-localized state initially located near the Fermi level.
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