Abstract
The interaction of spins in a spin-polarized test mass and those in a paramagentic salt, separated by a \ensuremath{\mu}-metal shield and a double-layer superconducting shield, was investigated. Our results set a limit on electron spin interactions and on moments which are not of electromagnetic origin. In terms of a standard dipole-dipole form, the limit is (2.7\ifmmode\pm\else\textpm\fi{}2.4)\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}14}$ of the interaction strength between the magnetic moments of the electrons. Compared to previous results, this is more than a twentyfold improvement.
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