4.4 Article

A comparative study of superconductivity at LaAlO3/SrTiO3 and BaTiO3/LaAlO3/SrTiO3 heterointerfaces

Journal

AIP ADVANCES
Volume 13, Issue 6, Pages -

Publisher

AIP Publishing
DOI: 10.1063/5.0159304

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Lead-free BaTiO3 film was fabricated on LaAlO3/SrTiO3 heterostructure using pulsed laser deposition. The modulation effect of back-gate voltage on the superconductivity of LAO/STO and BTO/LAO/STO heterointerfaces was studied. The results show that the back-gate voltage can adjust the resistance at high temperatures, but cannot modulate the superconducting transition temperature of LAO/STO.
Lead-free BaTiO3 (BTO) film was fabricated by pulsed laser deposition on LaAlO3/SrTiO3 (LAO/STO) heterostructure in oxygen pressure of 2 x 10(-3) Pa, which is experimentally required for ensuring the two-dimensional electron gas at LAO/STO heterointerface. Modulation of back-gate voltage on the superconductivity of LAO/STO and BTO/LAO/STO heterointerfaces was studied. The results indicate that the back-gate voltage can adjust the resistance at high temperatures around 300 mK, while it does not modulate the superconducting transition temperature of LAO/STO, which occurs at 160 mK. As for BTO/LAO/STO, it still shows a superconducting transition-like behavior at 110 mK. However, when a negative back-gate voltage is applied, the superconducting transition-like behavior disappears, and after removing the voltage, unlike what was observed for LAO/STO, the superconductivity cannot be recovered. Given this, some underlying mechanisms are proposed.

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