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We performed neutron scattering experiments using polarization analysis on the high temperature superconductor Y B a z C~~0 6 .~ and the related semiconducting compounds YBazCu30s+, (a: = 0.11, 0.37). While we found paramagnetic fluctuations in the non-superconducting samples, we established severe upper bounds for the total magnetic intensity for the superconductor. We conclude that magnetic couplings as a source for superconductivity in YBazCu307 are highly unlikely.doi:10.1051/jphyscol:19888965 fatcat:4hvwityyd5bqzdmmvyh5wb646e