Abstract
We measured the electronic contribution to the polarized raman scattering of high quality superconducting YBa2Cu3O7 single crystals. For all samples we find a broad background scattering intensity, which is a superposition of two different contributions. The nearly temperature independent background in both Ag and B1g symmetry peaks at about 500cm−1 and is attributed to double magnon excitations. in addition we find a temperature dependent raman signal of Ag symmetry, which at low temperatures is attributed to quasiparticle excitations above the gap. From this electronic scattering we deduce a gap value of 225±50cm−1, approximately equivalent with 3.5 kBTc and consistent with previous tunneling-, far infrared- and Andreev scattering results. The present results indicate for the first time the coexistence of spin waves and superconductivity in YBa2Cu3O7.
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