Experiments were performed at the University of British Columbia (UBC) in a ultrahigh vacuum chamber equipped with a SPECS Phoibos 150 analyzer with ΔE = 6 meV and Δk=0.01 Å1 optimum energy and momentum resolutions, respectively, at a base pressure of better than p = 7 × 10−11 torr. Photons with an energy of 21.2 eV were provided by a SPECS UVS 300 monochromatized gas discharge lamp. Our home-built six-axis cryogenic manipulator allows for measurements between 300 and 3.5 K. Additional datasets were taken at the UBC with a second ARPES setup equipped with a Scienta R4000 analyzer and a Scienta VUV5000 ultraviolet source with ΔE = 1.5 meV and Δk=0.01 Å1 optimum energy and momentum resolutions, respectively, for 21.2-eV photons. The samples were annealed at 600°C for about 2 hours at p = 1 × 10−9 torr and then at 500°C for about 10 hours at p = 5 × 10−10 torr immediately before the ARPES measurements.

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