Evidence of surface barriers in single-crystal Tl2Ba2CuO6 superconductors

F. Zuo, D. Vacaru, H. M. Duan, A. M. Hermann

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


We report direct evidence of surface barriers in single crystals of Tl2Ba2CuO6 superconductors. Magnetization is measured as a function of temperature with magnetic field applied parallel to the c axis. For small field, a characteristic linear increase in M is observed at an onset temperature T1. For higher magnetic field, a new feature at low T is observed in the M(T) data. The flux penetration temperature is retarded to a higher temperature. The penetration field Hp at temperature below 50 K determined by the first linear rise in M(T) can be fitted with the relation Hp(T)=Hcexp(-T/T0), consistent with a model where two-dimensional pancakes penetrate the Bean-Livingston barrier by thermal activation. The low critical field Hc1 determined from the bulk penetration of vortices is also presented.

Original languageEnglish (US)
Pages (from-to)5535-5538
Number of pages4
JournalPhysical Review B
Issue number9
StatePublished - 1993

ASJC Scopus subject areas

  • Condensed Matter Physics


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