Abstract
We report on experimental measurements of the magnetically induced kinetic energy density (Ek) in single-crystal samples of YBa 2Cu 3O x (YBCO), with the oxygen contents x=6.72, 6.78, 6.85, and 6.90. Our study is restricted to the reversible region near the critical temperature (Tc), where the pinning force acting on the vortices is negligible. We use the expression Ek=−M⋅B (M is the magnetization and B is the magnetic induction) to calculate the kinetic energy density from magnetization measurements carried out in magnetic fields up to 5 T. We analyze the behavior of Ek as a function of the temperature for several isofield curves and construct Ek versus B curves as well. We find that Ek rises with the increase of the charge carriers density. Granularity effects and dimensionality of the order parameter can also be important factors contributing to the kinetic energy density.
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