Superconducting transition at 38 K in insulating-overdoped La2CuO4-La1.64Sr0.36CuO4 superlattices: evidence for interface electronic redistribution from resonant soft X-ray scattering.
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 layers were found to be optimally doped, suggesting they are the main drivers of superconductivity. Our results demonstrate the utility of RSXS for separating electronic from structural effects at oxide interfaces.
Smadici
S
S
Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA.
Lee
J C T
JC
Wang
S
S
Abbamonte
P
P
Logvenov
G
G
Gozar
A
A
Cavellin
C Deville
CD
Bozovic
I
I