Two-coil apparatus for measuring the absolute value of magnetic penetration depth amp;lgr; of superconductor films

摘要

An improved two-coil apparatus for measuring the absolute value of magnetic penetration depth &lgr; of superconductor films which is capable of measuring the absolute value of magnetic penetration depth which is denoted as &lgr; of a large area high temperature superconductor film using a low frequency or a static weak magnetic field, which includes a drive coil that is designed to suppresses the screening current of the film at the film edge a receive coil opposingly spaced- apart from the drive coil; sample holders disposed at the left- and right- sides of the receive coil; a large area low temperature superconductor film attached on the sample holder between the drive coil and the receive coil; and a large area high temperature superconductor film mounted on the large area low temperature superconductor film between the drive coil and the receive coil.