Superconducting Transition at 38 K in Insulating-Overdoped La₂CuO₄-La_1.64Sr_0.36CuO₄ Superlattices: Evidence for Interface Electronic Redistribution from Resonant Soft X-Ray Scattering

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S. Smadici,¹ J. C. T. Lee,¹ S. Wang,¹ P. Abbamonte,¹ G. Logvenov,² A. Gozar,² C. Deville Cavellin,^2,3 and I. Bozovic²
¹Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana, Illinois 61801, USA
²Brookhaven National Laboratory, Upton, New York 11973, USA
³Université Paris 12, 94010 Créteil Cedex, France

Received 12 June 2008; published 12 March 2009

Weuse resonant soft x-ray scattering (RSXS) to quantify the holedistribution in a superlattice of insulating La₂CuO₄ (LCO) and overdopedLa_2-xSr_xCuO₄ (LSCO). Despite its nonsuperconducting constituents, this structure is superconductingwith T_c=38 K. We found that the conducting holes redistribute electronicallyfrom LSCO to the LCO layers. The LCO layers werefound to be optimally doped, suggesting they are the maindrivers of superconductivity. Our results demonstrate the utility of RSXSfor separating electronic from structural effects at oxide interfaces.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.102.107004
DOI:	10.1103/PhysRevLett.102.107004
PACS:	74.78.-w; 73.21.-b; 74.72.-h 74.78.-w Superconducting films and low-dimensional structures 73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems 74.72.-h Cuprate superconductors YEAR: 2009

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Phys. Rev. Lett. 102, 107004 (2009) [4 pages]

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

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A new free weekly publication from APS

Superconducting Transition at 38 K in Insulating-Overdoped La₂CuO₄-La_1.64Sr_0.36CuO₄ Superlattices: Evidence for Interface Electronic Redistribution from Resonant Soft X-Ray Scattering