Observation of paramagnetic Meissner currents-evidence for Andreev bound surface states

W. Prusseit*, H. Walter, R. Semerad, H. Kinder, W. Assmann, H. Huber, B. Kabius, H. Burkhardt, D. Rainer, J. A. Sauls

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

4 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)396-402
Number of pages7
JournalPhysica C: Superconductivity and its applications
Volume317-318
DOIs
StatePublished - May 1999
EventProceedings of the 1998 1st Euroconference on Anomalous Complex Superconductors - Crete, Greece
Duration: Sep 26 1998Oct 3 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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