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4. INVESTIGATION OF METAL-INSULATOR TRANSITION Figure 4.17: Nickel 2p multiplet spectra at different temperatures for sample S-36AOw - a. The low temperature spectrum of nickel presents a notice- able broadening and a kink for higher binding energies in the Ni 2p3/2 envelope. Two constituent peaks are separated by about 1.34 eV. b. In comparison to lower temperature spectrum the separation of the constituent peaks of Ni 2p3/2 line has decreased slightly, together with the area ratio between the low and high energy constituent peak. d. The spectrum aquired well above the literature value of MI transition still presents a complicated envelope. However the peak separation as well as area ratio is smaller than at lower temperatures. even the long measurement duration a poor quality spectrum was collected in comparison to spectra at higher temperatures (figure 4.18). Details of spectra fitting are found in table 4.3. The temperature behaviour is in principle very similar to what was observed for sample S-36AOw. Peaks forming the envelope of nickel Ni 2p spectrum undergo changes in binding energy position and the peak area. As the temperature rises the constituent peaks forming 2p3/2 line shift towards each other so that the energy displacement between them decreases. At the same time a transfer of spectral weight from low to high energy constituent peak is observed. What distinguishes this film from the thicker one is that the observed changes are more drastic. Both 110PDF Image | Investigation of metal-insulator transition in magnetron sputtered samarium nickelate thin films
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