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The Pippard coherence length \ξ₀ (the size of a Cooper pair) in an type-I superconductor was determined directly through high-resolution of the nonlocal electrodynamic effect combining low-energy muon rotation spectroscopy and polarized neutron reflectometry. The factor Z=m_cp*/2m (m_cp* and m are the mass of the Cooper and the electron, respectively) resulting from the electron-phonon, and the temperature dependent London penetration depth\λL(T) were determined as well. A general expression linking \ξ₀, and \λL(0) is introduced and experimentally verified. This allows one to determine experimentally the Pippard coherence length superconductor, independent of whether the electrodynamics is or nonlocal, conventional or unconventional.
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Kozhevnikov et al. (2012) studied this question.