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Critical slowing of the spin and charge density wave order in thin film Cr following photoexcitation

Journal Article · · APL Materials
DOI:https://doi.org/10.1063/5.0206207· OSTI ID:2396736
 [1];  [2];  [3];  [3];  [3];  [3];  [3];  [3];  [4];  [4];  [4];  [3];  [2];  [3]
  1. Univ. of California, San Diego, La Jolla, CA (United States); SLAC
  2. Cornell Univ., Ithaca, NY (United States)
  3. Univ. of California, San Diego, La Jolla, CA (United States)
  4. SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
+ Show Author Affiliations

We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) orders of a chromium film following photoexcitation with an ultrafast optical laser pulse. The CDW is measured by ultrafast time-resolved x-ray diffraction of the CDW satellite that tracks the suppression and recovery of the CDW following photoexcitation. We find that as the temperature of the film approaches a discontinuous phase transition in the CDW and SDW orders, the time scales of recovery increase exponentially from the expected thermal time scales. We extend a Landau model for SDW systems to account for this critical slowing with the appropriate boundary conditions imposed by the geometry of the thin film system. This model allows us to assess the energy barrier between the available CDW/SDW states with different spatial periodicities.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; SC0018237; SC0001805; SC0019414
OSTI ID:
2396736
Journal Information:
APL Materials, Journal Name: APL Materials Journal Issue: 6 Vol. 12; ISSN 2166-532X
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
X-ray diffraction
chromium
free electron lasers
magnetism
phase transitions
photoexcitations
pump-probe experiments
thin films
ultrafast X-rays