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Pressure-temperature phase diagram for the system. The grey area represents the thermodynamically stable region for the formation of . Also shown are the pressure-temperature regions corresponding to the growing conditions of films reported in literature (see Refs. 7–9), and used in the present work.
UPS spectra of deposited on the clean and together with that of the clean substrate before deposition. An reference photoemission spectrum is also shown (see Ref. 16); (b) UPS spectra of films obtained co-depositing and on at two different substrate temperatures. reference photoemission spectrum is also shown (see Ref. 16). The spectra of (a) and (b) were measured at RT using a discharge lamp, a hemispherical electron energy analyzer at normal emission, with an overall energy and angular resolution of and , respectively. The spectra are normalized to the photon flux.
XPS spectrum of an thick epitaxial film obtained codepositing and on the substrate kept at . Inset: corresponding XAS spectrum at the threshold as a function of the angle between the light polarization direction and surface normal. Also shown (bottom) are the calculated absorption spectra on a crystal corresponding to light polarization perpendicular (solid line) and parallel (dotted line) to the axis of (see Ref. 18).
(a) Valence band spectra collected at normal emission as a function of the photon energy (from 90 up to ) of the film codeposited at , whose LEED pattern is shown in (b). The emitted electrons were collected by means of a double-pass hemispherical electron energy analyzer with an angular resolution of and an overall energy resolution of ; (c): calculated band structure along the direction (see Ref. 18) superimposed to the bidimensional plot of our experimental data (black: maximum, white: minimum).
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