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Transverse acoustic waves were generated electromagnetically at 9 GHz using In films with a conversion efficiency α of 5 ×{} 10^-5. A good agreement is found between theory and experiment and we obtain the value of 620 {} for the superconducting penetration depth λ at 0.4Tc and 5×{}10¹⁰ Ω^-1 cm^-2 for the ratio of the conductivity to the mean free path for In. From the temperature dependence of α below the superconducting transition temperature it is concluded that pair scattering at the surface does not conserve momentum.
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Goldstein et al. (1972) studied this question.
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