Onset of high-temperature superconductivity in the two-dimensional limit

T. Wang, K. M. Beauchamp, D. D. Berkley, B. R. Johnson, J. X. Liu, J. Zhang, A. M. Goldman

Research output: Contribution to journalArticlepeer-review

62 Scopus citations


The transition between insulating and superconducting behavior in the low-temperature limit has been explored with use of ultrathin Dy-Ba-Cu-O c-axis-oriented films prepared by molecular-beam epitaxy. The transition appears as a separatrix between sets of R(T) curves that exhibit either insulating or superconducting behavior in the T'0 limit. Superconductivity is found only when the normal-state sheet resistance is below a value close to h/4e2, or 6450 . Hall-effect data relate the depression of Tc with increasing sheet resistance to a reduction in hole concentration.

Original languageEnglish (US)
Pages (from-to)8623-8626
Number of pages4
JournalPhysical Review B
Issue number10
StatePublished - Jan 1 1991


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