Superconducting Transition at 38 K in Insulating-Overdoped La2CuO4-La1:64Sr0:36CuO4 Superlattices: Evidence for Interface Electronic Redistribution from Resonant Soft X-Ray Scattering

Journal Article · Thu Mar 12 00:00:00 EDT 2009 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.102.107004· OSTI ID:1040081

Smadici, S; Bozovic, I; Lee, J C. T.; Wang, S; Abbamonte, P; Logvenov, G; Gozar, A; Deville Cavellin, C

We use resonant soft x-ray scattering (RSXS) to quantify the hole distribution in a superlattice of insulating La{sub 2}CuO{sub 4} (LCO) and overdoped La{sub 2-x}Sr{sub x}CuO{sub 4} (LSCO). Despite its nonsuperconducting constituents, this structure is superconducting with T{sub 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.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE SC OFFICE OF SCIENCE (SC)
• DOE Contract Number: DE-AC02-98CH10886
• OSTI ID: 1040081
• Report Number(s): BNL-90212-2009-JA; PRLTAO; R&D Project: MA-509-MACA; KC0201050; TRN: US1202300
• Journal Information: Physical Review Letters, Vol. 102, Issue 10; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
DISTRIBUTION
OXIDES
SCATTERING
SUPERCONDUCTIVITY
SUPERLATTICES
SOFT X RADIATION