Considerations Limiting Zero-Resistance Currents in High-Temperature Superconductors
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CONSIDERATIONS LIMITING ZERO-RESISTANCE CURRENTS IN HIGH-TEMPERATURE SUPERCONDUCTORS M. TINKHAM Harvard University,
Cambridge, MA 02138
ABSTRACT The fundamental processes governing the appearance of dissipation due to flux motion in superconductors are reviewed. The dominant thermally-activated resistive processes are discussed, and evidence for a sharp melting transition of the flux lattice is assessed. INTRODUCTION In the classic type II superconductors, Abrikosov[l] showed that we must distinguish three phases in the H-T plane: the normal state for H>Hc 2 (T), the mixed state for Hcl(T) < H < Hc 2 (T), and the Meissner state for H < Hci(T). In the Meissner state, no flux penetrates and B = 0. In the normal state, B = H, while in the mixed state, 0
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