Two-coil apparatus for measuring the absolute value of magnetic penetration depth lambda of superconductor films

摘要

An improved two-coil apparatus for measuring the absolute value of magnetic penetration depth lambda of superconductor films which is capable of measuring the absolute value of magnetic penetration depth which is denoted as lambda 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.