Search results for "ultrafast pump-probe spectroscopy"

showing 2 items of 2 documents

Single crystal-like thin films of blue bronze

2021

Abstract Pulsed laser deposition technique was employed to grow thin films of K 0.3 M o O 3 on A l 2 O 3 (1-102) and S r T i O 3 (510) substrates. Structural and imaging characterization revealed good quality films with well oriented grains of few microns in length. Both non-selective (transport) and order-selective (femtosecond pump-probe spectroscopy) probes revealed charge density wave properties that are very close to those of the single crystals. The films exhibit metal-semiconductor phase transition in resistivity, pump-probe data show phase transition at the same temperature as the single crystal and the threshold for the photo-induced phase transition is approximately the same as in…

010302 applied physicsPhase transitionMaterials scienceMetals and AlloysAnalytical chemistry02 engineering and technologySurfaces and Interfaces021001 nanoscience & nanotechnology01 natural sciencesSurfaces Coatings and FilmsElectronic Optical and Magnetic MaterialsPulsed laser depositionBlue bronze (BB) ; Charge density waves (CDW) ; Thin films ; Single crystal-like ; Ultrafast pump-probe spectroscopyElectrical resistivity and conductivity0103 physical sciencesFemtosecondMaterials ChemistryThin film0210 nano-technologySpectroscopySingle crystalCharge density waveThin Solid Films
researchProduct

Ultrafast Coherent THz Lattice Dynamics Coupled to Spins in the van der Waals Antiferromagnet FePS3

2022

Coherent THz optical lattice and hybridized phonon–magnon modes are triggered by femtosecond laser pulses in the antiferromagnetic van der Waals semiconductor FePS3. The laser-driven lattice and spin dynamics are investigated in a bulk crystal as well as in a 380 nm-thick exfoliated flake as a function of the excitation photon energy, sample temperature and applied magnetic field. The pump-probe magneto-optical measurements reveal that the amplitude of a coherent phonon mode oscillating at 3.2 THz decreases as the sample is heated up to the Néel temperature. This signal eventually vanishes as the phase transition to the paramagnetic phase occurs, thus revealing its connection to the long-ra…

spintronicsSemiconductorsMechanics of MaterialsMechanical EngineeringGeneral Materials Scienceddc:530antiferromagnets2D materialsphononMaterialsmagnonultrafast pump-probe spectroscopyvan der Waals semiconductors
researchProduct