Low-temperature anomaly in the penetration depth of YBa2Cu3O7 films: Evidence for andreev bound states at surfaces

H. Walter, W. Prusseit, H. Semerad, H. Kinder, W. Assmann, H. Huber, H. Burkhardt, D. Rainer, James A Sauls

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

We report the observation of anomalous Meissner currents in thin films of superconducting YBCO with oriented internal surfaces introduced by heavy-ion bombardment. High-precision measurements of the penetration depth (λ) reveal an upturn in the temperature dependence of λ below T*≈15 K. 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 to arise from surface currents that are carried by surface-induced Andreev bound states.

Original languageEnglish (US)
Pages (from-to)3598-3601
Number of pages4
JournalPhysical Review Letters
Volume80
Issue number16
DOIs
StatePublished - Jan 1 1998

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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