Coexistence of high electron-mobility, unpaired spins, and superconductivity at high carrier density SrTiO3-based interfaces

Abstract

The t2g band structure of SrTiO3-based two-dimensional electron gasses have been found to play a role in features such as the superconducting dome, high-mobility transport, and the magnitude of spin-orbit coupling. This adds to the already very diverse range of phenomena, including magnetism and extreme magnetoresistance, exhibited by this particular material platform. Tuning and/or combining these intriguing attributes could yield significant progress within quantum and spintronics technologies. Doing so demands precise control of the parameters, which requires a better understanding of the factors that affect them. Here, we present the effects of the t2g band-order inversion, stemming from the growth of spinel-structured γ−Al2O3 onto perovskite SrTiO3. Electronic transport measurements show that, with LaAlO3/SrTiO3 as the reference, the carrier density and electron mobility are enhanced, and the sample displays a reshaping of the superconducting dome. Additionally, unpaired spins are evidenced by increasing anomalous Hall effect with decreasing temperature, entering the same temperature range as the superconducting transition. Finally, it is argued that the high-mobility dxz/yz-band is more likely than the dxy-band to host the supercurrent.

Source-reported materials — not catalogue approval

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