Structure of singly terminated polar DyScO3 (110) surfaces


Kleibeuker, J.E. and Kuiper, B. and Harkema, S. and Blank, D.H.A. and Koster, G. and Rijnders, A.J.H.M. and Tinnemans, P. and Vlieg, E. and Rossen, P.B. and Siemons, W. and Portale, G. and Ravichandran, J. and Szepieniec, J. and Ramesh, R. (2012) Structure of singly terminated polar DyScO3 (110) surfaces. Physical review B: Condensed matter and materials physics, 85 (16). 165413 - . ISSN 1098-0121

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Abstract:We have studied the polar surface of singly terminated DyScO3 (110) crystals by reflective high-energy electron diffraction, surface x-ray diffraction and angle-resolved mass spectroscopy of recoiled ions. These techniques show that the surfaces are (1 × 1) reconstructed, which points to the absence of ordered cation vacancies at the surface. The best surfaces were obtained after a selective chemical wet etch. We suggest that for ScO2 terminated surfaces, adsorbates, or oxygen vacancies are most likely to occur in order to overcome the polarity difference between stoichiometric bulk crystal and vacuum.
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