Abstract
We have investigated distributions of unit-cell-high steps on SrTiO 3(0 0 1) vicinal surfaces using scanning tunneling microscopy. We have estimated the terrace width distributions of SrTiO 3(0 0 1) surfaces annealed at 800 °C for various misorientation angles smaller than 4°. By comparing the obtained terrace width distributions with theoretical predictions, we have shown that a long range repulsive interaction and a short range attractive interaction act between steps. The step distribution on the surfaces of misorientations smaller than 2° is governed only by the repulsive interaction and regularly stepped surfaces are formed, while the effect of the short range interaction on the surface morphology becomes significant for larger misorientation angles.
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