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Superconducting Transition at 38 K in Insulating-Overdoped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Cu</mml:mi><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>4</mml:mn></mml:msub><mml:mtext mathvariant="normal">−</mml:mtext><mml:msub><mml:mi>La</mml:mi><mml:mn>1.64</mml:mn></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mn>0.36</mml:mn></mml:msub><mml:mi>Cu</mml:mi><mml:msub><mml:mi …
We use resonant soft x-ray scattering (RSXS) to quantify the hole distribution in a superlattice of insulating La2CuO4 (LCO) and overdoped La2-xSrxCuO4 (LSCO). Despite its nonsuperconducting constituents, this structure is superconducting with T_{c}=38 K. We found that the conducting holes redistribute electronically from LSCO to the LCO layers. The LCO …