The intermediate state structure in cylindrical superconductors

✍ Scribed by John F. Cochran; Robert S. Kaeser

• Publisher: Elsevier Science
• Year: 1957
• Weight: 815 KB
• Volume: 23
• Category: Article
• ISSN: 0031-8914
• DOI: 10.1016/s0031-8914(57)94249-0

✦ Synopsis

The average magnetic moment per unit volume of a long cylinder consisting ol alternate discs of superconducting and normal material has been measured in a transverse magnetic field as a function of the disc thicknesses. Using the data so obtained, in conjunction with a laminar model of the intermediate state structure in transverse superconducting cylinders, it has been possible to calculate the dependence of the structure periodicity, p, as a function of applied field, H, and the dimensionless ratio Alto, where r0 is the cylinder radius and A is a parameter which characterizes the magnitude of the surface free energy at the boundary between normal and superconducting phases. For H lying between the limits 0.62 H, < H < 0.75 Hc the result can be expressed simply as p = 6.3 H,/H ~/A/ro

The dependence oi the magnetization on applied field has also been calculated, and has been used to obtain values of d for tin from magnetization and resistivity data on thin tin wires.