Return to index
Author(s):
W. Prusseita, H. Walter, R. Semerad, H. Kinder, W. Assmann, H. Huber, B. Kabius, H. Burkhardt, D. Rainer, J.A. Sauls
Comments: Invited Paper at the 22nd International Conference on Low Temperature Physics,
Helsinki, Finland; 7 pages with 5 figures.
Journal-ref:
Physica B 280, 176 (2000)
[DOI]
Abstract:
We report the observation of anomalous Meissner currents (AMCs) in thin films of
superconducting YBCO with oriented internal surfaces introduced by heavy-ion
bombardment. High-precision measurements of the penetration depth λ(T)
reveal an upturn in the temperature dependence of λ(T)
below T ≈ 15 K, which is strongly
dependent on the orientation and density of the surfaces. The magnitude of the
observed effect, its onset temperature and its dependence on the orientation of
the surfaces are in quantitative agreement with the theory of surface effects in
d-wave superconductors. The anomaly is interpreted as a consequence of surface-induced
Andreev bound states (ABSs) carrying paramagnetic currents.
Paper: [PDF]
Return to index