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Title: The influence of charge and magnetic order on polaron and acoustic phonon dynamics in LuFe2O4

Femtosecond optical pump-probe spectroscopy is used to reveal the influence of charge and magnetic order on polarondynamics and coherent acoustic phonon oscillations in single crystals of charge-ordered, ferrimagnetic LuFe2O4. We experimentally observed the influence of magnetic order on polarondynamics. We also observed a correlation between charge order and the amplitude of the acoustic phonon oscillations, due to photoinduced changes in the lattice constant that originate from the photoexcited electrons. As a result, this provides insight into the general behavior of coherent acoustic phonon oscillations in charge-ordered materials.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [3] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Center for Integrated Nanotechnologies and Theoretical Div.
  3. Rutgers Univ., Piscataway, NJ (United States). Rutgers Center for Emergent Materials and Dept. of Physics and Astronomy
  4. Tulane Univ., New Orleans, LA (United States). Dept. of Physics and Engineering Physics
  5. Univ. of Nebraska, Lincoln, NE (United States). Dept. of Physics and Astronomy, Nebraska Center for Materials and Nanoscience
Publication Date:
Report Number(s):
LA-UR-15-22133
Journal ID: ISSN 0003-6951; APPLAB
Grant/Contract Number:
FG02-07ER46382; AC52-06NA25396
Type:
Published Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 107; Journal Issue: 4; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (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; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 36 MATERIALS SCIENCE; phonons; photoexcitations; lattice constants; polarons; stress strain relations
OSTI Identifier:
1204688
Alternate Identifier(s):
OSTI ID: 1212179; OSTI ID: 1247297