Enhanced Superconductivity in Superlattices of High-$T_c$ Cuprates

Abstract

The electronic properties of multilayers of strongly correlated models for cuprate superconductors are investigated using cluster dynamical mean-field techniques. We focus on combinations of underdoped and overdoped layers and find that the superconducting order parameter in the overdoped layers is enhanced by the proximity effect of the strong pairing scale originating from the underdoped layers. The enhanced order parameter can even exceed the maximum value in uniform systems. This behavior is well reproduced in slave-boson mean-field calculations which also find higher transition temperatures than in the uniform system.

4 pages, 4 figures

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• Anomalous doping evolution of superconductivity and quasiparticle interference in Bi2Sr2Ca2Cu3O10+δ trilayer cuprates
• Superconductivity in bilayer $t$-$t^{\prime }$ Hubbard models
• Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures
• Spectral changes in layered $f$-electron systems induced by Kondo hole substitution in the boundary-layer
• Enhanced superconducting gap in the outer CuO${}_2$ plane of the trilayer cuprate (Hg,Re)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Signature of T${}_{\text{c}}$ above 111 K in Li-doped (Bi,Pb)-2223 superconductors: synergistic nature of hole concentration, coherence length and Josephson interlayer coupling
• Pairing susceptibility in the weakly interacting multilayer Hubbard model evaluated by direct perturbative expansion
• Electronic reconstruction and enhanced superconductivity at La${}_{1.6-x}$Nd${}_{0.4}$Sr${}_x$CuO${}_4$/La${}_{1.55}$Sr${}_{0.45}$CuO${}_4$ bilayer interface
• Enhanced superconductivity via layer differentiation in trilayer Hubbard model
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$