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

• Published in: arXiv.org
• 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: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 05.03.2024
• Subjects: Boundary conditions; Charge density waves; Chromium; Phase transitions; Photoexcitation; Physics - Materials Science; Recovery; Spin density waves; Thin films; Time
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2403.00267

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.