μSR and Magnetometry Study of the Type I Superconductor BeAu

We present Muon Spin Rotation and Relaxation (μSR) measurements as well as demagnetisation corrected magnetometry measurements on polycrystalline samples of the noncentrosymmetric superconductor BeAu. From μSR measurements in a transverse field we find that BeAu is a rare Type I superconducting alloy. To account for demagnetising effects in magnetometry measurements we produced an ellipsoidal sample for which we could calculate the demagnetising factor and found results comparable with our µSR measurments. From both sets of measurements we have constructed a phase diagram from 30 mK to Tc ≈ 3.25K. We also studied the effect of hydrostatic pressure and find that 450 MPa decreases Tc by 44 mK, comparable to the change seen in several elemental type I superconductors.