SEARCH FOR ANOMALOUS SPIN-SPIN INTERACTIONS USING A PARAMAGNETIC SALTWITH A DC SQUID

We use a paramagnetic salt TbF3 with a DC SQUID to search for a possib le anomalous spin-spin interaction of two rotating HoFe3 polarized bod ies with the TbF3 paramagnetic salt. We set limits on the electron-ele ctron spin interaction and the electron-nucleus spin interaction. In t erms of a standard dipole-dipole form, the limits are (-2.1 +/- 3.5) X 10(-14) for the anomalous spin-spin interaction of electrons in terms of the interaction strength between the magnetic moments of the elect rons, and (-2.1 +/- 3.6) X 10(-8) for the anomalous spin-spin interact ion between the electron and the Ho-nucleus in terms of the interactio n strength between the magnetic moments of the electron and the Ho-nuc leus.