DID YOU KNOW? DTIC has over 3.5 million final reports on DoD funded research, development, test, and evaluation activities available to our registered users. Click HERE
to register or log in.
CRITICAL CURRENT AND FIELD IN NON-IDEAL SUPERCONDUCTORS,
AVCO EVERETT RESEARCH LAB EVERETT MASS
The upper critical fields of the V-Ti system were measured at 4.2 degrees K and agree with Gorkov-Shapovals expression for the upper critical field of superconducting alloys. The critical current of samples of V with varying Ti content and also of Nb-25 Zr, all of rectangular cross-section .008 in. x .025 in., was measured as a function of the magnetic field H sub a applied parallel to the width of the strip. When the critical current I is plotted in units of the Silsbee current I sub c based on the thermo dynamic critical field H sub c, versus the applied magnetic field measured in units of the Gorkov-Shapoval upper critical field H sub 2, the experimental data for all the samples tested fall on a single curve. This critical curve is deduced from the free energy of a laminar mixed state model such that the applied current flows mainly within a penetration depth along the width of the strip end effects are neglected. Author
AF04 694 33