Using a CO2 laser to directly heat the crystals from the back side, SrTiO3 substrates may be thermally prepared in situ for epitaxy without the need for ex-situ etching and annealing. We find that the formation of large terraces with straight steps at 900–1100 °C is independent of the formation of the ideal surface reconstruction for epitaxy, which requires temperatures in excess of 1200 °C to complete. The process may be universal, at least for perovskite oxide surfaces, as it also works, at different temperatures, for LaAlO3 and NdGaO3, two other widely used oxide substrate materials.Using a CO2 laser to directly heat the crystals from the back side, SrTiO3 substrates may be thermally prepared in situ for epitaxy without the need for ex-situ etching and annealing. We find that the formation of large terraces with straight steps at 900–1100 °C is independent of the formation of the ideal surface reconstruction for epitaxy, which requires temperatures in excess of 1200 °C to complete. The process may be universal, at least for perovskite oxide surfaces, as it also works, at different temperatures, for LaAlO3 and NdGaO3, two other widely used oxide substrate materials.

中文翻译：

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钙钛矿氧化物表面热制备过程中表面形态和重建的独立性

使用 CO2 激光从背面直接加热晶体，SrTiO3 衬底可以在原位热制备用于外延，无需异位蚀刻和退火。我们发现在 900-1100°C 下形成具有直台阶的大阶地与外延的理想表面重建的形成无关，这需要超过 1200°C 的温度才能完成。该工艺可能是通用的，至少对于钙钛矿氧化物表面，因为它也适用于不同温度的 LaAlO3 和 NdGaO3，这是另外两种广泛使用的氧化物衬底材料。使用 CO2 激光直接加热背面的晶体 SrTiO3衬底可以在原位热制备用于外延而无需异位蚀刻和退火。我们发现在 900-1100°C 下形成具有直台阶的大阶地与外延的理想表面重建的形成无关，这需要超过 1200°C 的温度才能完成。该工艺可能是通用的，至少对于钙钛矿氧化物表面而言，因为它在不同温度下也适用于 LaAlO3 和 NdGaO3，这是另外两种广泛使用的氧化物衬底材料。