AIP Advances · 2012 · 11 citations · 18 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsMaterials PhysicsSolid State PhysicsDielectric CeramicsDielectric MaterialsDielectric PropertiesDielectricsOptical Properties Of SolidsTerahertz SpectroscopyConductivityElectronic ConductivityOxygen VacanciesPhonon-phonon InteractionsTerahertz Conductivity MeasurementTerahertz Dielectric ResponseTerahertz Time-domain SpectroscopyTime-domain Terahertz Spectroscopy
We present THz conductivity of LaAlO3 (LAO) as a function of temperature and annealing, using terahertz time-domain spectroscopy (THz-TDS). We observed that, after annealing, spectral weight redistribution occurs, such that the real conductivity σ1(ω) changed from a featureless and almost frequency-independent spectrum, into one where peaks occur near the phonon frequencies. These phonon frequencies increase with increasing temperature. We attribute the appearance of these absorption peaks to the diffusion and relocation of oxygen vacancies. The dielectric functions of annealed LAO are well fitted with the Drude-Lorentz model.
18
A Strain-Driven Morphotropic Phase Boundary in BiFeO <sub>3</sub>
R. J. Zeches, Marta D. Rossell, Jinxing Zhang et al. · Science · 2009 · 1.2K citations
Natural Sciences, Materials Engineering, Materials Science +17
Vibrational thermodynamics of materials
Brent Fultz · Progress in Materials Science · 2009 · 677 citations