Landau and Ott scaling for the kinetic energy density in the low-Tc conventional superconductors Li2Pd3B and Nb

The scaling approach recently proposed by Landau and Ott for isothermal magnetization curves is extended to the average kinetic energy density of the condensate. Two low-T-c superconductors, Nb and Li2Pd3B are studied and their isothermal reversible magnetization is shown to display Landau and Ott scaling. Good agreement is obtained for the upper critical field H-c2(T) determined from the Abrikosov approximation for the reversible region (standard linear extrapolation of the magnetization curve) and from the maximum of the kinetic energy curves. For the full range of data, which includes the irreversible region, the isothermal dMB/H-2 curves for Li2Pd3B show an impressive collapse into a single curve over the entire range of field measurements. The Nb isothermal dMB/H-2 curves exhibit the interesting feature of a constant and temperature independent minimum value.