Fig. 1: The surface structure of SR-STO. | npj Quantum Materials

Fig. 1: The surface structure of SR-STO.

From: Field-induced resistance peak in a superconducting niobium thin film proximity coupled to a surface reconstructed SrTiO3

Fig. 1

The LEED patterns of TiO2-terminated STO(100) substrates at room temperature: a no surface structural reconstruction. b\(\sqrt{5}\;\times\;\sqrt{5}\)R26.6° surface structure after UHV annealing. d c(4 × 2) surface structure after UHV annealing. c, f are the simulated LEED patterns based on the \(\sqrt{5}\;\times\;\sqrt{5}\) R26.6° and c(4 × 2) surface structures, respectively, showing excellent agreements with observed LEED patterns. The red and blue circles represent the secondary diffraction spots from different surface structure domains. Those surface structures after UHV annealing are stable after cooling down to lower temperatures. e shows the LEED pattern at 6 K, which is identical to that with c(4 × 2) surface structure at room temperature.

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