Abstract
We have measured isofield curves for the kinetic energy density (E k) in the superconducting state of a Bi2Sr2CaCu2O8+δ (Bi-2212) single crystal. These curves were determined from magnetization versus temperature experiments that were analyzed according to the prescription of the virial theorem of superconductivity. The magnetization measurements were carried out using the zero field cooling (ZFC) and field cooled cooling (FCC) protocols. This procedure allows the determination of the temperature interval where the magnetization behaves reversibly. This study is limited to the temperature region where the pinning effects are negligible. The field-induced kinetic energy is associated with the currents circulating around the vortices. The obtained results allow the estimation of the upper critical field and are in accordance to the expectations of the Abrikosov theory for type-II superconductors.
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