Ultrafast magnetic dynamics in insulating YBa${}_2$Cu${}_3$O${}_{6+x}$ revealed by time resolved two-magnon Raman Scattering

Abstract

Measurement and control of magnetic order and correlations in real time is a rapidly developing scientific area relevant for magnetic memory and spintronics [1,15]. In these experiments an ultra-short laser pulse (pump) is first absorbed by excitations carrying electric dipole moment. These then give their energy to the magnetic subsystem monitored by a time-resolved probe. A lot of progress has been made in investigations of ferromagnets but antiferromagnets are more challenging. Here we introduce time-resolved two-magnon Raman scattering as a novel real time probe of magnetic correlations especially well-suited for antiferromagnets. Its application to the antiferromagnetic charge transfer insulator YBa${}_2$Cu${}_3$O${}_{6+x}$ revealed rapid demagnetization within 90fs of photoexcitation. The relaxation back to thermal equilibrium is characterized by much slower timescales. We interpret these results in terms of slow relaxation of the charge sector and rapid equilibration of the magnetic sector to a prethermal state characterized by parameters that change slowly as the charge sector relaxes.

References in corpus (20)

• Inelastic Light Scattering From Correlated Electrons
• Exponentially slow heating in periodically driven many-body systems
• Rigorous Bound on Energy Absorption and Generic Relaxation in Periodically Driven Quantum Systems
• Disentangling the electronic and phononic glue in a high-Tc superconductor
• Anomalous High-Energy Spin Excitations in La2CuO4
• Ultrafast energy and momentum resolved dynamics of magnetic correlations in photo-doped Mott insulator Sr${}_2$IrO${}_4$
• Time-resolved Raman Spectroscopy of Optical Phonons in Graphite: Phonon Anharmonic Coupling and Anomalous Stiffening
• Metastable superfluidity of repulsive fermionic atoms in optical lattices
• High-Frequency Spin Waves in YBa2Cu3O6.15
• Phase Fluctuations and the Absence of Topological Defects in Photo-excited Charge Ordered Nickelate
• Probing photo-induced melting of antiferromagnetic order in La0.5Sr1.5MnO4 by ultrafast resonant soft X-ray diffraction
• Ultrafast charge recombination in photoexcited Mott-Hubbard insulator
• Resonant Two-Magnon Raman Scattering in Cuprate Antiferromagnetic Insulators
• Mechanism of Ultrafast Relaxation of a Photo-Carrier in Antiferromagnetic Spin Background
• Witnessing the formation and relaxation of massive quasi-particles in a strongly correlated electron system
• Real-time manifestation of strongly coupled spin and charge order parameters in stripe-ordered nickelates via time-resolved resonant x-ray diffraction
• Novel Electron-Phonon Relaxation Pathway in Graphite Revealed by Time-Resolved Raman Scattering and Angle-Resolved Photoemission Spectroscopy
• Probing ultrafast spin-relaxation and precession dynamics in a cuprate Mott insulator with 7-fs optical pulses
• Magnetic excitations and amplitude fluctuations in insulating cuprates
• Electron-phonon coupling in undoped cuprate $YB{a}_{2}C{u}_3{O}_6$ estimated from Raman and optical conductivity spectra

Cited by in corpus (7)

• Exciton-driven antiferromagnetic metal in a correlated van der Waals insulator
• Interacting topological Dirac magnons
• Dynamical phases transitions in periodically driven Bardeen-Cooper-Schrieffer systems
• Time-domain study of coupled collective excitations in quantum materials
• Relaxation timescales and electron-phonon coupling in optically-pumped YBa${}_2$Cu${}_3$O${}_{6+x}$ revealed by time-resolved Raman scattering
• Exciton-assisted low-energy magnetic excitations in a photoexcited Mott insulator on a square lattice
• X-Ray Scattering from Light-Driven Spin Fluctuations in a Doped Mott Insulator