Light-scattering study of the superconducting energy gap in Y<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>single crystals
R. HacklPhysik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of GermanyW. GläserPhysik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of GermanyPaul MüllerPhysik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of GermanyDietrich EinzelPhysik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of GermanyK. AndresPhysik Department E21, Technische Universität München, D-8046 Garching, Federal Republic of Germany
1988lv
ABI
Аннотация
Raman scattering experiments have been performed on single-crystal samples of Y${\mathrm{Ba}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7}$ in order to investigate superconducting gap excitations. The electronic contribution to the total scattering intensity can be fitted well by a theoretical model of light scattering from quasiparticle pairs. Depending on the measuring symmetry, mean gap energies are found ranging from 3.0 to $5.5 {k}_{B}{T}_{c}$.
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