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 LaVO 3 thin film grown on SrTiO 3 (001). The OOR modes of VO 6 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 P 2 1 / 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 cm 2 V –1 s –1 and a colossal, nonsaturating linear magnetoresistance of ∼1250%. These values represent a significant improvement over previously reported LaVO 3 /SrTiO 3 systems, demonstrating a superior magnetotransport performance. These results of merit establish oxygen-engineered LaVO 3 /SrTiO 3 heterostructures as promising platforms for spintronic applications.