Low-Field Magnetization of the Triangular Microhole Lattice on Pb Film of 1.8-µm Lattice Constant

Shin'ichiro NAKATA  Masaaki YOSHIDA  Takekazu ISHIDA  

IEICE TRANSACTIONS on Electronics   Vol.E85-C   No.3   pp.814-817
Publication Date: 2002/03/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Superconductive Electronics)
Category: Novel Devices and Device Physics
superconducting microholes,  vortex,  matching effect,  Pb,  SQUID,  

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It is of considerable interest to study the vortex behavior of a multiply connected superconductor for potential applications of vortex devices. Our sample is made of a type-I superconductor Pb and a capillary plate. The nominal sizes are 1-µm in hole diameter and 1.8-µm in lattice pitch. The microholes form triangular lattice while a superconducting network consists of a honeycomb lattice. When each hole accommodates a single vortex 0, an applied magnetic field becomes a nominal matching field (7.83 G). We measure the magnetization curve of sample by means of a SQUID (superconducting quantum interference device) magnetometer in the accurate small fields on the order of Gauss. We find a sharp magnetization peak at 8.2 G at temperatures near the critical temperature Tc.