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

We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) order 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 reco...

Full description

Saved in:
Bibliographic Details
Published in:arXiv.org 2024-03
Main Authors: Patel, Sheena K K, Oleg Yu Gorobtsov, Cela, Devin, Hrkac, Stjepan B, Nelson, Hua, Rajasekhar Medapalli, Shabalin, Anatoly G, Wingert, James, Glownia, James M, Zhu, Diling, Chollet, Matthieu, Shpyrko, Oleg G, Singer, Andrej, Fullerton, Eric E
Format: Article
Language:English
Subjects:
Boundary conditions
Charge density waves
Chromium
Phase transitions
Photoexcitation
Recovery
Spin density waves
Thin films
Time
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We report on the evolution of the charge density wave (CDW) and spin density wave (SDW) order 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 order, 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 available CDW/SDW states with different spatial periodicities.
ISSN:2331-8422