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Supercritical Carbon Dioxide-Assisted Interface Formation of LaAlO3/SrTiO3 for Room-Temperature Ferromagnetism
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DOI：10.1002/apxr.202600005.png)
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Abstract
En 中文
The LaAlO3/SrTiO3 (LAO/STO) interface is a vital platform for emergent quantum phenomena, yet conventional methods for controlling its properties are often invasive. This work introduces supercritical CO2 (SC CO2) as a clean, tunable physical strain field to achieve a reversible diamagnetic-to-ferromagnetic transition in 3D LAO/STO composite powders via pressure tuning. Structural analysis reveals that under specific conditions (100 degrees C, 14 MPa), SC CO2 induces a tensile strain along the c-axis in LAO. This strain is coupled through the coherent interface to the STO lattice, leading to cooperative lattice distortion without introducing significant chemical defects. Magnetic measurements confirm that the emergent ferromagnetism originates strictly from the interface and is precisely correlated with this unique lattice strain condition. This work unveils a new mechanism of interfacial lattice strain-driven ferromagnetism and establishes a novel, non-destructive paradigm for tuning quantum states at complex oxide interfaces using supercritical fluids.
Keywords:
interfacial ferromagnetism
LaAlO3/SrTiO3 interface
strain engineering
supercritical carbon dioxide
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IF:
2.8
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85
Citations:
482
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