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000307289 1001_ $$0P:(DE-H253)PIP1013738$$aMankowsky, R.$$b0$$eCorresponding author
000307289 245__ $$aNonlinear Lattice Dynamics as a Basis for Enhanced Superconductivity in $YBa_2Cu_3O_{6.5}$
000307289 260__ $$aLondon$$bMacmillan28177$$c2014
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000307289 520__ $$aTerahertz-frequency optical pulses can resonantly drive selected vibrationalmodes in solids and deformtheir crystal structures. Incomplex oxides, this method has been used to melt electronic order, drive insulator-to-metal transitions and induce superconductivity. Strikingly, coherent interlayer transport strongly reminiscent of superconductivity can be transiently induced up to room temperature (300 kelvin) in YBa$_2$Cu$_3$O$_{6+x}$. Here we report the crystal structure of this exotic non-equilibrium state, determined by femtosecond X-ray diffraction and ab initio density functional theory calculations.We find thatnonlinear lattice excitationinnormal-state YBa$_2$Cu$_3$O$_{6+x}$ at above the transitiontemperature of 52 kelvin causes a simultaneous increase anddecrease in the Cu–O$_2$ intra-bilayer and, respectively, interbilayer distances, accompanied by anisotropic changes in the in-plane O–Cu–O bond buckling. Density functional theory calculations indicate that these motions cause drastic changes in the electronic structure. Among these, the enhancement in the d$_{x^2-y^2}$ character of the in-plane electronic structure is likely to favour superconductivity.
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000307289 7001_ $$0P:(DE-H253)PIP1023430$$aSubedi, A.$$b1$$eCorresponding author
000307289 7001_ $$0P:(DE-H253)PIP1007487$$aFörst, M.$$b2
000307289 7001_ $$0P:(DE-H253)PIP1010231$$aMariager, S. O.$$b3
000307289 7001_ $$0P:(DE-HGF)0$$aChollet, M.$$b4
000307289 7001_ $$0P:(DE-H253)PIP1010230$$aLemke, H. T.$$b5
000307289 7001_ $$0P:(DE-HGF)0$$aRobinson, J. S.$$b6
000307289 7001_ $$0P:(DE-HGF)0$$aGlownia, J. M.$$b7
000307289 7001_ $$0P:(DE-HGF)0$$aMinitti, M. P.$$b8
000307289 7001_ $$0P:(DE-HGF)0$$aFrano, A.$$b9
000307289 7001_ $$0P:(DE-H253)PIP1005278$$aFechner, M.$$b10
000307289 7001_ $$0P:(DE-HGF)0$$aSpaldin, N. A.$$b11
000307289 7001_ $$0P:(DE-HGF)0$$aLoew, T.$$b12
000307289 7001_ $$0P:(DE-H253)PIP1010052$$aKeimer, B.$$b13
000307289 7001_ $$0P:(DE-HGF)0$$aGeorges, A.$$b14
000307289 7001_ $$0P:(DE-H253)PIP1006448$$aCavalleri, A.$$b15
000307289 773__ $$0PERI:(DE-600)1413423-8$$a10.1038/nature13875$$gVol. 516, no. 7529, p. 71 - 73$$n7529$$p71 - 73$$tNature$$v516$$x1476-4687$$y2014
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