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

Journal Article · · Structural Dynamics
DOI:https://doi.org/10.1063/1.4977672· OSTI ID:1369309
 [1];  [1];  [1];  [1];  [2];  [2];  [3];  [3];  [3];  [3];  [2];  [4];  [5]
  1. Max Planck Institute for the Structure and Dynamics of Matter, Hamburg (Germany)
  2. Max Planck Institute for Solid State Research, Stuttgart (Germany)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Diamond Light Source, Didcot (United Kingdom)
  5. 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
Citation Metrics:
Cited by: 19 works
Citation information provided by
Web of Science

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Cited By (16)

Probing dynamics in quantum materials with femtosecond X-rays journal June 2018
Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment journal September 2018
Parametric amplification of optical phonons journal November 2018
Measuring non-equilibrium dynamics in complex solids with ultrashort X-ray pulses
  • Buzzi, Michele; Först, Michael; Cavalleri, Andrea
  • Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 377, Issue 2145 https://doi.org/10.1098/rsta.2017.0478
journal April 2019
Transiently enhanced interlayer tunneling in optically driven high- T c superconductors journal October 2017
Ultrafast transient increase of oxygen octahedral rotations in a perovskite journal August 2019
Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment text January 2018
Ultrafast transient increase of oxygen octahedral rotations in a perovskite text January 2019
Transiently enhanced interlayer tunneling in optically driven high $T_c$ superconductors text January 2017
Parametric amplification of optical phonons preprint January 2017
Ultrafast transient increase of oxygen octahedral rotations in a perovskite text January 2019
Ultrafast phononic switching of magnetization journal January 2021
Evidence for a vestigial nematic state in the cuprate pseudogap phase journal June 2019
Phonon-driven ultrafast symmetry lowering in a Bi 2 Se 3 crystal journal December 2020
Optical parametric amplification of phase-stable terahertz-to-mid-infrared pulses studied in the time domain journal January 2021
A critical analysis of models and experimental evidence of negative capacitance stabilization in a ferroelectric by capacitance matching to an adjacent dielectric layer preprint January 2020