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- W2078179916 abstract "Motivated by the observation of a superconducting energy gap far above the equilibrium critical temperature ${mathit{T}}_{mathit{c}}$ in an Al film forming the center electrode of a Nb/${mathrm{AlO}}_{mathit{x}}$/Al/${mathrm{AlO}}_{mathit{x}}$/Nb structure we analyze the mechanism of gap enhancement in symmetric double-barrier superconducting tunnel junctions. It is found that such structures are very effective in creating a nonthermal distribution of quasiparticles in the middle electrode. At certain bias conditions this leads, according to the BCS gap equation, to the appearance of a nonzero superconducting energy gap even at temperatures up to several times the equilibrium ${mathit{T}}_{mathit{c}}$. So the double-barrier arrangement offers the remarkable possibility of making a material become superconducting by applying a voltage or passing a current. Calculated current-voltage characteristics exhibit current steps at voltages eV=2(${mathrm{ensuremath{Delta}}}_{mathrm{Nb}}$-${mathrm{ensuremath{Delta}}}_{mathrm{Al}}$) and eV=2(${mathrm{ensuremath{Delta}}}_{mathrm{Nb}}$+${mathrm{ensuremath{Delta}}}_{mathrm{Al}}$) in agreement with measured curves. Calculations of the thermodynamic stability of the nonequilibrium superconducting state indicate the possibility of hysteresis effects around these current steps." @default.
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- W2078179916 date "1993-03-01" @default.
- W2078179916 modified "2023-09-24" @default.
- W2078179916 title "Enhancement of superconductivity far above the critical temperature in double-barrier tunnel junctions" @default.
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- W2078179916 doi "https://doi.org/10.1103/physrevb.47.5157" @default.
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