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| Home > Publications database > Nonlinear Lattice Dynamics as a Basis for Enhanced Superconductivity in $YBa_2Cu_3O_{6.5}$ |
| Journal Article | PUBDB-2016-03143 |
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2014
Macmillan28177
London
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Please use a persistent id in citations: doi:10.1038/nature13875
Abstract: Terahertz-frequency optical pulses can resonantly drive selected vibrationalmodes in solids and deformtheir crystal structures. Incomplex oxides, this method has been used to melt electronic order, drive insulator-to-metal transitions and induce superconductivity. Strikingly, coherent interlayer transport strongly reminiscent of superconductivity can be transiently induced up to room temperature (300 kelvin) in YBa$_2$Cu$_3$O$_{6+x}$. Here we report the crystal structure of this exotic non-equilibrium state, determined by femtosecond X-ray diffraction and ab initio density functional theory calculations.We find thatnonlinear lattice excitationinnormal-state YBa$_2$Cu$_3$O$_{6+x}$ at above the transitiontemperature of 52 kelvin causes a simultaneous increase anddecrease in the Cu–O$_2$ intra-bilayer and, respectively, interbilayer distances, accompanied by anisotropic changes in the in-plane O–Cu–O bond buckling. Density functional theory calculations indicate that these motions cause drastic changes in the electronic structure. Among these, the enhancement in the d$_{x^2-y^2}$ character of the in-plane electronic structure is likely to favour superconductivity.
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