Fig. 1.
(A) Magnetization in the superconducting state. Temperature dependence of magnetic susceptibility (magnetization M/H) of the Ba214 compound measured in a magnetic field of 30 Oe. Both ZFC and FC modes show a sharp superconducting transition with an onset at Tc = 73 K. (B) Superconducting volume fraction in terms of superfluid density estimated from μSR plotted as a function of temperature. (C) Temperature dependence of the specific heat measured in the temperature range around Tc on a Ba214 sample for 0- and 12-T applied magnetic fields.