Two-band superconductivity through structural and electronic reconstruction on interface: YBa₂Cu₃O₇/LaAlO₃(001)

Novel physical phenomena arising from the complex interplay between spin, charge, orbital, and lattice orders can emerge in perovskite-type oxide heterostructures. Here, we investigate electronic structures on interface of YBa2Cu3O7/LaAlO3 heterostructure prepared by pulsed laser deposition with combination spherical aberration-corrected scanning transmission electron microscopy density functional theory. Both reconstructed normal interfaces are observed at sub-angstrom resolution, these superconducting planes closest to corresponding known as CuO2(a) CuO2(c) planes, respectively. Due reconstruction charge redistribution, plane moves closer bond length in-plane Cu apical oxygen reduced. Consequently, d3z2−r2 orbital loss electrons further results two orbitals (dx2−y2 d3z2−r2) crossing Fermi level, showing two-band superconductivity behavior interface. However, remains unaffected due protection reservoir layer exhibits similar bulk cuprate superconductors, where only dx2−y2 contribute states level. These suggest that interfacial might be a possible pathway manipulate