Nature of the Superconducting State in High-Tc Cuprates

        Recent evidence of three-dimensional xy-critical behavior in the Meissner phase of cuprate superconductors strongly suggests that, close to the transition temperature, the fluctuations of the order parameter are
        essentially those of a neutral superfluid or xy-model. Full confirmation of xy-behavior requires the sound waves of the superfluid to dominate the low-temperature properties. Our calculation of the sound wave contribution to the magnetic penetration depth, which yields lambda (T)/lambda (0)=1+AT**4 in the limit T -> 0, is in remarkable agreement with recent experiments. Thus, thermal fluctuations not only mediate 3D-xy-critical point behavior
        but dominate the entire finite temperature behavior in the ordered state. The nature of the superconducting state in the cuprates then appears to be essentially that of superfluidity.

By: T. Schneider and M. H. Pedersen

Published in: RZ2572 in 1994


This Research Report is available. This report has been submitted for publication outside of IBM and will probably be copyrighted if accepted for publication. It has been issued as a Research Report for early dissemination of its contents. In view of the transfer of copyright to the outside publisher, its distribution outside of IBM prior to publication should be limited to peer communications and specific requests. After outside publication, requests should be filled only by reprints or legally obtained copies of the article (e.g., payment of royalties). I have read and understand this notice and am a member of the scientific community outside or inside of IBM seeking a single copy only.

Questions about this service can be mailed to .