TY - JOUR
T1 - Observation of paramagnetic Meissner currents-evidence for Andreev bound surface states
AU - Prusseit, W.
AU - Walter, H.
AU - Semerad, R.
AU - Kinder, H.
AU - Assmann, W.
AU - Huber, H.
AU - Kabius, B.
AU - Burkhardt, H.
AU - Rainer, D.
AU - Sauls, J. A.
N1 - Funding Information:
The work of JAS was supported in part by the STC for Superconductivity through NSF Grant no. 91-20000. D.R. and J.A.S. also acknowledge support from the Max-Planck-Gesellschaft and the Alexander von Humboldt-Stiftung.
PY - 1999/5
Y1 - 1999/5
N2 - 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.
AB - 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.
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U2 - 10.1016/S0921-4534(99)00086-6
DO - 10.1016/S0921-4534(99)00086-6
M3 - Conference article
AN - SCOPUS:17144465178
SN - 0921-4534
VL - 317-318
SP - 396
EP - 402
JO - Physica C: Superconductivity and its applications
JF - Physica C: Superconductivity and its applications
T2 - Proceedings of the 1998 1st Euroconference on Anomalous Complex Superconductors
Y2 - 26 September 1998 through 3 October 1998
ER -