Grain Boundary Induced Magneto-Far Infrared Resonances in Superconducting YBa2Cu3O7-δ Thin Films
Abstract
Spectral features induced by 45 in-plane misoriented grains have been observed in the far infrared magneto-transmission of YBa2Cu3O% 7-δ thin films. Two strong dispersive features are found at 80 and 160 cm-1 and a weaker one at 116 cm-1. The data can be well represented by Lorentzian oscillator contributions to the conductivity. Several possible interpretations are discussed. We conclude that the resonances are due to vortex core excitations.
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