Localized high-T<inf>c</inf> superconductivity on the surface of Na-Doped WO<inf>3</inf>

S. Reich, G. Leitus, Y. Tssaba, Y. Levi, A. Sharoni, O. Millo

Research output: Contribution to journalArticlepeer-review


WO3 crystals were doped with Na on the surface to ∼7% nominal atomic concentration. Scanning tunneling microscopy and spectroscopy were employed, together with magnetization measurements, in the study of these crystals. Tunneling experiments reveal superconducting islands, 20-150 nm in size, covering about 10% of the surface, the rest of which is insulating. Magnetization measurements show that the superconducting phase formed at the surface has a critical temperature of 91 K, while tunneling spectroscopy yields superconducting gaps having values up to 2Δ/kTc ∼ 4. Presumably most of the sodium is concentrated in these islands and therefore they are metallic in nature, above 30% in atomic concentration. This material is therefore a noncuprate superconductor with a high critical temperature. © 2000 Plenum Publishing Corporation.
Original languageEnglish
JournalJournal of Superconductivity and Novel Magnetism
Issue number5
StatePublished - 1 Dec 2000


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