Abstract
This paper presents results on the coexistence of fluid and superfluidity phases or the interface superconductivity in LaAlO3/SrTiO3. The orbital nature of an electron largely affects its spin-orbit interaction, which can be determined independently either from the weak-localization model in normal state or from the upper critical fields in superconducting state. A discrepancy in the extracted spin-orbit coupling parameters is uncovered
Highlights
The relativistic spin-orbit coupling (SOC) is a fundamental physical quantity, which turns out to be an important basis for some newly discovered phenomena, such as topologicalprotected electronic phases [1,2,3] and unconventional superconductivity in noncentrosymmetric systems [4,5]
An oxide molecular beam epitaxy (MBE) system with a base pressure better than 7 × 10−11 torr was used to grow ultrathin epitaxial LAO films on atomically flat TiO2-terminated (100) STO substrates [23]
The sheet densities of nLH and nHH, shown in the lower panel of Fig. 1, are obtained by linear fittings to the Hall resistance data in the low field regime (0 μ0H 1 T) and high field regime (9 μ0H 10 T), respectively. Both nLH and nHH gradually increase with increasing Vg going from a sheet density of n2D ≈ 2 × 1013 to ≈4 × 1013 cm−2 as Vg varies from −20 V to +50 V, where the corresponding μH changes by more than eightfold from μH ≈ 8.0 to 65.0 cm2/V s
Summary
The relativistic spin-orbit coupling (SOC) is a fundamental physical quantity, which turns out to be an important basis for some newly discovered phenomena, such as topologicalprotected electronic phases [1,2,3] and unconventional superconductivity in noncentrosymmetric systems [4,5]. In a twodimensional disordered system, SOC can largely influence the weak localization (WL) effect, where the transverse weakfield magnetoresistance (MR) can go from a negative MR to a positive MR as the SOC strength increases [6,7] This provides a practical method to extract the SOC parameters from the fittings to the magnetoconductance (MC) data [8,9]. The spin-orbit scattering parameter can be extracted from an implicit equation with complex digamma functions, relating the Hc2 and superconducting transition temperature Tc. An advancement was put forward by Klemm, Luther, and Beasley (KLB) [12], where they further extended a similar concept to a type-II and layered superconductor. Comparing to the magnetoconductance data fittings on the same sample in normal state with weak localization model, a striking model dependence on the determination of SOS lifetime was uncovered, which supports the intriguing electronic phase separation at the LAO/STO interface
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