Europhysics Letters (EPL) · 1991 · 41 citations · 10 references
Natural SciencesMaterials SciencePhysicsCondensed Matter PhysicsSolid State PhysicsThin FilmsElectron-phonon InteractionsInfrared SpectroscopyMicrowave SpectroscopySuperconducting MaterialsSuperconducting Thin FilmsEnergy Band GapFar-infrared SpectroscopyLow-temperature MaterialsLow-temperature SuperconductorsMicrowave AbsorptionMicrowave Absorption SpectraSuperconducting GapYttrium Barium Copper Oxide Films
We report on a study of far-infrared and microwave intragap absorption of a YBa2Cu3O7-δ thin film at low temperature. Our results suggest a superconducting energy gap with 2Δ(0)/kBTc ≈ 7 and residual, intragap absorption for temperatures T ≪ Tc that consists of three portions, a microwave and a far-infrared band of possibly nonintrinsic nature and sharp phonon resonances of intrinsic nature.
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Millimeter wave surface resistance of epitaxially grown YBa2Cu3O7−<i>x</i> thin films
N. Klein, G. Müller, H. Piel et al. · Applied Physics Letters · 1989 · 191 citations
S. Tajima, Munetoshi Seki, Y. Hidaka et al. · Journal of the Optical Society of America B · 1989 · 143 citations