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Title: Multiple Supersonic Phase Fronts Launched at a Complex-Oxide Heterointerface

Selective optical excitation of a substrate lattice can drive phase changes across heterointerfaces. This phenomenon is a nonequilibrium analogue of static strain control in heterostructures and may lead to new applications in optically controlled phase change devices. Here, we make use of time-resolved nonresonant and resonant x-ray diffraction to clarify the underlying physics and to separate different microscopic degrees of freedom in space and time. We also measure the dynamics of the lattice and that of the charge disproportionation in NdNiO 3 , when an insulator-metal transition is driven by coherent lattice distortions in the LaAlO 3 substrate. We find that charge redistribution propagates at supersonic speeds from the interface into the NdNiO 3 film, followed by a sonic lattice wave. Our results establish a hierarchy of events for ultrafast control at complex-oxide heterointerfaces, when combined with measurements of magnetic disordering and of the metal-insulator transition.
Authors:
 [1] ;  [2] ;  [1] ;  [1] ;  [3] ;  [4] ;  [4] ;  [2] ;  [5] ;  [6] ;  [7] ;  [7] ;  [7] ;  [8] ;  [8] ;  [8] ;  [3] ;  [4] ;  [9]
  1. Max Planck Inst. for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg (Germany)
  2. Center for Free Electron Laser Science and Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  3. Delft Univ. of Technology (Netherlands). Kavli Inst. of Nanoscience
  4. Univ. of Geneva (Switzerland). Dept. of Quantum Matter Physics
  5. Center for Free Electron Laser Science, Hamburg (Germany); SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Pulse Inst.
  6. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division and Advanced Light Source
  7. SLAC National Accelerator Lab., Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
  8. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
  9. Max Planck Inst. for the Structure and Dynamics of Matter, Center for Free Electron Laser Science, Hamburg (Germany); Univ. of Oxford (United Kingdom). Dept. of Physics
Publication Date:
Grant/Contract Number:
AC02-76SF00515; NT-11118; 319286; FP7/2007-2013
Type:
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 118; Journal Issue: 2; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1361067
Alternate Identifier(s):
OSTI ID: 1338663