Oxygen-Modulated Oxygen Octahedral Structure and Magnetotransport Properties of LaVO ₃ /SrTiO ₃ Heterostructures

Tuning the concentration and distribution of oxygen vacancies can modulate the oxygen octahedral rotations (OOR) and consequently the physical properties of the LaVO3 thin film grown on SrTiO3 (001). The OOR modes of VO6 in the films were characterized via measuring the half-integer reflections using X-ray diffraction, which reveals a structural transition from orthorhombic Fmmm to monoclinic P21/m with the increase in oxygen vacancy content via growing at high temperatures or low oxygen pressures. Concurrently, the resulting two-dimensional electron gas (2DEG) achieved a Hall mobility of 30000 cm2 V–1 s–1 and a colossal, nonsaturating linear magnetoresistance of ∼1250%. These values represent a significant improvement over previously reported LaVO3/SrTiO3 systems, demonstrating a superior magnetotransport performance. These results of merit establish oxygen-engineered LaVO3/SrTiO3 heterostructures as promising platforms for spintronic applications.