Journal
PHYSICAL REVIEW B
Volume 92, Issue 3, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.92.035149
Keywords
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Funding
- Air Force Office of Scientific Research [FA9550-11-1-0033]
- National Science Foundation through the MRSEC program [DMR-1120296]
- Army Research Office [W911NF-09-1-0415]
- National Science Foundation [DGE-0707428]
- IGERT program [DGE-0654193]
- NSERC PGS
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We use angle-resolved photoemission spectroscopy to study the doping evolution of infinite-layer Sr1-xLaxCuO2 thin films grown by molecular-beam epitaxy. At low doping, the material exhibits a dispersive lower Hubbard band typical of the superconducting cuprate parent compounds. As carriers are added to the system, a continuous evolution from charge-transfer insulator to superconductor is observed, with the initial lower Hubbard band pinned well below the Fermi level and the development of a coherent low-energy band with electron doping. This two-component spectral function emphasizes the important role that strong local correlations play even at relatively high doping levels. Electron diffraction probes reveal a p(2 x 2) surface reconstruction of the material at low doping levels. Using a number of simple assumptions, we develop a model of this reconstruction based on the polar nature of the infinite-layer structure. Finally, we provide evidence for a thickness-controlled transition in ultrathin films of SrCuO2 grown on nonpolar SrTiO3, highlighting the diverse structural changes that can occur in polar complex oxide thin films.
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