Optically induced lattice deformations, electronic structure changes, and enhanced superconductivity in YBa2Cu3O6.48
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
- Max Planck Institute for Solid State Research, Stuttgart (Germany)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Diamond Light Source, Didcot (United Kingdom)
- Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany); Univ. of Oxford, Oxford (United Kingdom)
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 results, we calculate changes in the soft x-ray absorption spectra at the Cu L-edge. As a result, femtosecond x-ray pulses from a free electron laser are used to probe changes in absorption at two photon energies along this spectrum and provide data consistent with these predictions.
- Research Organization:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC02-76SF00515
- OSTI ID:
- 1369309
- Journal Information:
- Structural Dynamics, Vol. 4, Issue 4; ISSN 2329-7778
- Publisher:
- American Crystallographic Association/AIPCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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