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  Optically induced lattice deformations, electronic structure changes and enhanced superconductivity in YBa2Cu3O6.48

Mankowsky, R., Fechner, M., Först, M., von Hoegen, A., Porras, J., Loew, T., et al. (2017). Optically induced lattice deformations, electronic structure changes and enhanced superconductivity in YBa2Cu3O6.48. Structural Dynamics, 4(4): 044007. doi:10.1063/1.4977672.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002C-5D70-E Version Permalink: http://hdl.handle.net/21.11116/0000-0004-93E1-7
Genre: Journal Article

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https://arxiv.org/abs/1701.08358 (Preprint)
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https://dx.doi.org/10.1063/1.4977672 (Publisher version)
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 Creators:
Mankowsky, R.1, Author              
Fechner, M.1, Author              
Först, M.1, Author              
von Hoegen, A.1, Author              
Porras, J.2, Author
Loew, T.2, Author
Dakovski, G.L.3, Author
Seaberg, M.3, Author
Möller, S.3, Author
Coslovich, G.3, Author
Keimer, B.2, Author
Dhesi, S.S.4, Author
Cavalleri, A.1, 5, Author              
Affiliations:
1Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society, ou_1938293              
2Max Planck Institute for Solid State Research, Stuttgart, Germany, ou_persistent22              
3Linac Coherent Light Source, Stanford Linear Accelerator Center (SLAC) National Accelerator Laboratory, Menlo Park, CA, ou_persistent22              
4Diamond Light Source, Harwell Science and Innovation Campus, Didcot OX11 0DE, United Kingdom , ou_persistent22              
5Department of Physics, Clarendon Laboratory, University of Oxford, UK, ou_persistent22              

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 Abstract: Resonant optical excitation of apical oxygen vibrational modes in the normal state of underdoped YBa2Cu3O6+x induces a transient state with optical properties similar to those of the equilibrium superconducting state. Amongst these, a divergent imaginary conductivity and a plasma edge are transiently observed in the photo-stimulated state. Femtosecond hard x-ray diffraction experiments have been used in the past to identify the transient crystal structure in this non-equilibrium state. Here, we start from these crystallographic features and theoretically predict the corresponding electronic rearrangements that accompany these structural deformations. Using density functional theory, we predict enhanced hole-doping of the CuO2 planes. The empty chain Cu dy2-z2 orbital is calculated to strongly reduce in energy, which would increase c-axis transport and potentially enhance the interlayer Josephson coupling as observed in the THz-frequency response. From these calculations, we predict changes in the soft x-ray absorption spectra at the Cu L-edge. Femtosecond x-ray pulses from a free electron laser are used to probe these changes in absorption at two photon energies along this spectrum, and provide data consistent with these predictions.

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Language(s): eng - English
 Dates: 2017-01-292017-022017-02-28
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: arXiv: 1701.08358
DOI: 10.1063/1.4977672
 Degree: -

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Project name : rgy. The SXR Instrument is funded by a consortium whose membership includes the LCLS, Stanford University through the Stanford Institute for Materials Energy Sciences (SIMES), Lawrence Berkeley National Laboratory (LBNL, contract No. DE-AC02-05CH11231). University of Hamburg through the BMBF priority program FSP 301, and the Center for Free Electron Laser Science (CFEL). The research leading to these results has received funding from the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013) / ERC Grant Agreement n° 319286 (Q-MAC).
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Title: Structural Dynamics
Source Genre: Journal
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Publ. Info: Melville, NY : American Institute of Physics
Pages: - Volume / Issue: 4 (4) Sequence Number: 044007 Start / End Page: - Identifier: ISSN: 2329-7778
CoNE: /journals/resource/2329-7778