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We use resonant soft x-ray scattering (RSXS) to quantify the holedistribution in a superlattice of insulating La2CuO4 (LCO) and overdopedLa_{2-x}Sr_{x}CuO4 (LSCO). Despite its non-superconducting constituents, thisstructure is superconducting with T_{c}=38 K. We found that the conductingholes redistribute electronically from LSCO to the LCO layers. The LCO layerswere found to be optimally doped, suggesting they are the main drivers ofsuperconductivity. Our results demonstrate the utility of RSXS for separatingelectronic from structural effects at oxide interfaces.

physical review letters

Superconducting transition at 38 K in insulating-overdoped  La2CuO4-La1.64Sr0.36CuO4 superlattices: Evidence for interface electronic  redistribution from resonant soft x-ray scattering