A route to high temperature superconductivity in composite systems

Abstract

Apparently, some form of local superconducting pairing persists to temperatures well above the maximum observed $T_c$ in underdoped cuprates, \textit{i.e.} $T_c$ is suppressed due to the small phase stiffness. With this in mind, we consider the following question -- Given a system with a high pairing scale ${\Delta }_0$ but with $T_c$ reduced by phase fluctuations, can one design a composite system in which $T_c$ approaches its mean-field value, $T_c\to T_{MF}\approx {\Delta }_0/2\$?Here,westudyasimpletwocomponentmodelinwhicha"metalliclayer"with$Δ_0=0$iscoupledbysingle-particletunnelingtoa"pairinglayer"with$Δ_0 >0 $butzerophasestiffness.Weshowthatinthelimitthatthebandwidthofthemetalismuchlargerthan$Δ_0$,$T_c$ofthecompositesystemcanreachtheupperlimit$T_c \approxΔ_0/2$.

Journal Ref. added. See also http://physics.aps.org/articles/v1/19

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• Anomalous Enhancement of the Superconducting Transition Temperature in Electron-Doped Cuprate Heterostructures
• Hybridization of Bogoliubov-quasiparticles between adjacent CuO${}_2$ layers in the triple-layer cuprate Bi${}_2$Sr${}_2$Ca${}_2$Cu${}_3$O${}_{10+\delta }$ studied by ARPES
• Triple-gap superconductivity of MgB2 - (La,Sr)MnO3 composite. Which of the gaps is proximity induced?
• Upper bounds on superconducting and excitonic phase-stiffness for interacting isolated narrow bands
• Artificial Atoms Based on Correlated Materials
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• Enhancing $T_{\mathrm{c}}$ in a composite superconductor/metal bilayer system: a dynamical cluster approximation study
• Global room-temperature superconductivity in graphite
• Origin of the T${}_c$ enhancement in heterostructure cuprate superconductors
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• Tuning vortex fluctuations and the resistive transition in superconducting films with a thin overlayer
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• Enhancement of the critical temperature in cuprate superconductors by inhomogeneous doping
• Flat-band-induced superconductivity in synthetic bilayer optical lattices
• Interface and bulk superconductivity in superconducting heterostructures with enhanced critical temperatures
• Intrinsic high-temperature superconductivity in ternary iron selenides
• Local and Global Superconductivity in Bismuth
• Enhanced superconducting gap in the outer CuO${}_2$ plane of the trilayer cuprate (Hg,Re)Ba${}_2$Ca${}_2$Cu${}_3$O${}_{8+\delta }$
• Designing Heterostructures with Higher Temperature Superconductivity
• Evidence of a pseudogap driven by competing orders of multi-band origin in the ferromagnetic superconductor Sr${}_{0.5}$Ce${}_{0.5}$FBiS${}_2$
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• Quantum phase transition driven by competing intralayer and interlayer hopping in bilayer nickelates
• 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
• Strong enhancements to superconducting properties of 1D systems from metallic reservoirs
• High Temperature Superconductivity Dominated by Inner Underdoped CuO${}_2$ Planes in Quadruple-Layer Cuprate (Cu,C)Ba${}_2$Ca${}_3$Cu${}_4$O${}_{11+\delta }$