Condensation of collective charge ordering in Chromium

Abstract

Here we report on the dynamics of the structural order parameter in a chromium film using synchrotron radiation in response to photo-induced ultra-fast excitations. Following transient optical excitations the effective lattice temperature of the film rises close to the Néel temperature and the charge density wave (CDW) amplitude is reduced. Although we expect the electronic charge ordering to vanish shortly after the excitation we observe that the CDW is never completely disrupted, which is revealed by its unmodified period at elevated temperatures. We attribute the persistence of the CDW to the long-lived periodic lattice displacement in chromium. The long-term evolution shows that the CDW revives to its initial strength within 1 ns, which appears to behave in accordance with the temperature dependence in equilibrium. This study highlights the fundamental role of the lattice distortion in charge ordered systems and its impact on the re-condensation dynamics of the charge ordered state in strongly correlated materials.

arXiv comment17 pages, 7 figures

References in corpus (6)

• Correlated Electrons in High Temperature Superconductors
• Complexity in Strongly Correlated Electronic Systems
• Fermi surface nesting and the origin of Charge Density Waves in metals
• Non-thermal separation of electronic and structural orders in a persisting charge density wave
• Ultrafast dynamics of charge density waves in 4Hb-TaSe2 probed by femtosecond electron diffraction
• Strong electron-lattice coupling as the mechanism behind charge density wave transformations in transition-metal dichalcogenides

Cited by in corpus (4)

• Watching the birth of a charge density wave order: diffraction study on nanometer-and picosecond-scales
• Photoinduced Enhancement of the Charge Density Wave Amplitude
• Laser-Induced Charge-Density-Wave Transient Depinning in Chromium
• Ultrafast spin density wave transition in Chromium governed by thermalized electron gas