Abstract
Spin-polarized tunneling is used to measure the energy difference delta between spin-up and spin-down electrons in a magnetic field in thin films of superconducting Al. delta decreases from 2..mu../sub B/H at low temperature and field to 0.8 (2..mu../sub B/H) as the phase boundary T/sub c/(H) is approached. This change in delta provides the first measurement of the l = 0 antisymmetric Fermi-liquid parameter G/sup 0/ in a real metal and the first direct evidence for the renormalization of the Pauli field in high-field superconductivity.
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